{"id":10531,"date":"2026-09-26T11:33:29","date_gmt":"2026-09-26T10:33:29","guid":{"rendered":"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/aqa\/3-2-2-group-2-the-alkaline-earth-metals\/"},"modified":"2026-09-26T11:33:29","modified_gmt":"2026-09-26T10:33:29","slug":"3-2-2-group-2-the-alkaline-earth-metals","status":"publish","type":"page","link":"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/aqa\/3-2-2-group-2-the-alkaline-earth-metals\/","title":{"rendered":"3.2.2 Group 2, the Alkaline Earth Metals"},"content":{"rendered":"\n<div class=\"ols-aqa322-page\">\n\n  <aside class=\"ols-sidebar\">\n  <div class=\"ols-sidebar-header\">\n    <h3>Revision Notes<\/h3>\n    <p>A Level Chemistry<\/p>\n  <\/div>\n\n  <div class=\"ols-topic-group\">\n    <h4>3.2.2 Group 2<\/h4>\n\n    <ul class=\"ols-topic-list\">\n      <li>\n        <a href=\"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/aqa\/3-2-2-group-2-the-alkaline-earth-metals\/\">3.2.2 Overview<\/a>\n      <\/li>\n      <li>\n        <a href=\"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/aqa\/3-2-2-group-2-the-alkaline-earth-metals\/trends-down-groups-1-and-2\/\">Trends Down Groups 1 and 2<\/a>\n      <\/li>\n      <li>\n        <a href=\"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/aqa\/3-2-2-group-2-the-alkaline-earth-metals\/reactions-of-the-group-1-and-2-elements\/\">Reactions of the Group 1 and 2 Elements<\/a>\n      <\/li>\n      <li>\n        <a href=\"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/aqa\/3-2-2-group-2-the-alkaline-earth-metals\/oxides-hydroxides-and-carbonates\/\">Oxides, Hydroxides and Carbonates<\/a>\n      <\/li>\n      <li>\n        <a href=\"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/aqa\/3-2-2-group-2-the-alkaline-earth-metals\/solubility-trends-and-the-sulfate-test\/\">Solubility Trends and the Sulfate Test<\/a>\n      <\/li>\n      <li>\n        <a href=\"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/aqa\/3-2-2-group-2-the-alkaline-earth-metals\/thermal-stability-and-flame-colours\/\">Thermal Stability and Flame Colours<\/a>\n      <\/li>\n      <li>\n        <a href=\"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/aqa\/3-2-2-group-2-the-alkaline-earth-metals\/tests-for-ions\/\">Tests for Ions<\/a>\n      <\/li>\n    <\/ul>\n  <\/div>\n\n  <div class=\"ols-topic-group\">\n    <h4>Other Sections<\/h4>\n\n    <ul class=\"ols-topic-list\">\n      <li>\n        <a href=\"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/aqa\/3-1-7-oxidation-reduction-and-redox-equations\/\">3.1.7 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24%), linear-gradient(135deg, #f5f3ff 0%, #a78bfa 45%, #6d28d9 100%); }\n    .ols-aqa322-visual--so { background: radial-gradient(circle at 24% 18%, rgba(255,255,255,0.46), transparent 24%), linear-gradient(135deg, #ecfeff 0%, #22d3ee 45%, #0e7490 100%); }\n    .ols-aqa322-visual--ts { background: radial-gradient(circle at 24% 18%, rgba(255,255,255,0.46), transparent 24%), linear-gradient(135deg, #fffbeb 0%, #fbbf24 45%, #b45309 100%); }\n    .ols-aqa322-visual--ti { background: radial-gradient(circle at 24% 18%, rgba(255,255,255,0.46), transparent 24%), linear-gradient(135deg, #f0fdfa 0%, #2dd4bf 45%, #0f766e 100%); }\n    .ols-aqa322-visual--tc { background: radial-gradient(circle at 24% 18%, rgba(255,255,255,0.46), transparent 24%), linear-gradient(135deg, #f8fafc 0%, #94a3b8 45%, #334155 100%); }\n    .ols-aqa322-visual--ht { background: radial-gradient(circle at 24% 18%, rgba(255,255,255,0.46), transparent 24%), linear-gradient(135deg, #ecfdf5 0%, #34d399 45%, #047857 100%); }\n    .ols-aqa322-visual--ho { background: radial-gradient(circle at 24% 18%, rgba(255,255,255,0.46), transparent 24%), linear-gradient(135deg, #fefce8 0%, #facc15 45%, #a16207 100%); }\n    .ols-aqa322-visual--cd { background: radial-gradient(circle at 24% 18%, rgba(255,255,255,0.46), transparent 24%), linear-gradient(135deg, #f0fdf4 0%, #86efac 45%, #166534 100%); }\n    .ols-aqa322-visual--hi { background: radial-gradient(circle at 24% 18%, rgba(255,255,255,0.46), transparent 24%), linear-gradient(135deg, #fdf4ff 0%, #d8b4fe 45%, #7e22ce 100%); }\n  <\/style>\n\n  <!-- BREADCRUMB BAR -->\n  <div class=\"ols-aqa322-breadcrumb-bar\">\n    <div class=\"ols-aqa322-container\">\n      <nav class=\"ols-aqa322-breadcrumb\" aria-label=\"Breadcrumb\">\n          <a href=\"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/\">Revision Notes<\/a> \/\n          <a href=\"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/\">A Level Chemistry<\/a> \/\n          <a href=\"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/aqa\/\">AQA<\/a> \/\n          <span>3.2.2 Group 2<\/span>\n        <\/nav>\n    <\/div>\n  <\/div>\n\n  <!-- INTRO -->\n  <section class=\"ols-aqa322-intro\">\n    <div class=\"ols-aqa322-container\">\n      <div class=\"ols-aqa322-intro-inner\">\n        <div>\n          <div class=\"ols-aqa322-eyebrow\">AQA A Level Chemistry<\/div>\n          <h1>3.2.2<br>Group 2<\/h1>\n          <div class=\"ols-aqa322-accent-bar\"><\/div>\n          <p class=\"ols-aqa322-intro-lead\">Section 3.2.2 covers the trends in atomic radius, first ionisation energy and melting point from magnesium to barium, the reactions with water, magnesium in the extraction of titanium, the solubilities of the hydroxides and sulfates, the uses of magnesium hydroxide, calcium hydroxide, calcium oxide and calcium carbonate, and the acidified barium chloride test for sulfate ions. Group 1 is kept on the pages for comparison; the thermal stability and full tests pages are revision support for required practical 4.<\/p>\n        <\/div>\n        <div class=\"ols-aqa322-info-grid\">\n          <div class=\"ols-aqa322-info-card\"><div class=\"ols-aqa322-info-card-label\">Exam Paper<\/div><div class=\"ols-aqa322-info-card-value\">Paper 1 &amp; 3<\/div><div class=\"ols-aqa322-info-card-sub\">7405\/1 and 7405\/3<\/div><\/div>\n          <div class=\"ols-aqa322-info-card\"><div class=\"ols-aqa322-info-card-label\">Specification Points<\/div><div class=\"ols-aqa322-info-card-value\">3.2.2 i &#8211; x<\/div><div class=\"ols-aqa322-info-card-sub\">10 statements<\/div><\/div>\n          <div class=\"ols-aqa322-info-card\"><div class=\"ols-aqa322-info-card-label\">Topic Parts<\/div><div class=\"ols-aqa322-info-card-value\">6 pages<\/div><div class=\"ols-aqa322-info-card-sub\">Revision notes available<\/div><\/div>\n          <div class=\"ols-aqa322-info-card\"><div class=\"ols-aqa322-info-card-label\">Exam Board<\/div><div class=\"ols-aqa322-info-card-value\">AQA<\/div><div class=\"ols-aqa322-info-card-sub\">7405 (2015 onwards)<\/div><\/div>\n        <\/div>\n      <\/div>\n    <\/div>\n  <\/section>\n\n  <!-- TOPIC CARDS -->\n  <section class=\"ols-aqa322-topics\">\n    <div class=\"ols-aqa322-container\">\n      <div class=\"ols-aqa322-section-header\">\n        <h2 class=\"ols-aqa322-section-title\">Revision Notes<\/h2>\n        <p class=\"ols-aqa322-section-sub\">Work through 3.2.2 Group 2 in a structured sequence.<\/p>\n      <\/div>\n      <div class=\"ols-aqa322-cards-grid\">\n\n        <!-- Card 1: Trends Down Groups 1 and 2 -->\n        <a class=\"ols-aqa322-card ols-aqa322-card--available\" href=\"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/aqa\/3-2-2-group-2-the-alkaline-earth-metals\/trends-down-groups-1-and-2\/\">\n          <div class=\"ols-aqa322-card-img-wrap\">\n            <div class=\"ols-aqa322-visual ols-aqa322-visual--tr\">\n              <div class=\"ols-aqa322-visual-panel\">\n                <div class=\"ols-aqa322-visual-kicker\">Down the group<\/div>\n                <div class=\"ols-aqa322-visual-main\">Group<br>Trends<\/div>\n                <div class=\"ols-aqa322-config-line\" aria-hidden=\"true\"><span>radius, ionisation energy, reactivity<\/span><\/div>\n              <\/div>\n            <\/div>\n            <div class=\"ols-aqa322-card-num\">1<\/div>\n            <span class=\"ols-aqa322-card-status ols-aqa322-card-status--available\">Available<\/span>\n          <\/div>\n          <div class=\"ols-aqa322-card-body\">\n            <p class=\"ols-aqa322-card-title\">Trends Down Groups 1 and 2<\/p>\n            <p class=\"ols-aqa322-card-desc\">The trends down Group 2: atomic radius, ionisation energies, melting points and the increase in reactivity down the group.<\/p>\n            <span class=\"ols-aqa322-card-cta\">Start revising<svg viewBox=\"0 0 16 16\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M3 8h10M9 4l4 4-4 4\"><\/path><\/svg><\/span>\n          <\/div>\n        <\/a>\n\n        <!-- Card 2: Reactions of the Group 1 and 2 Elements -->\n        <a class=\"ols-aqa322-card ols-aqa322-card--available\" href=\"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/aqa\/3-2-2-group-2-the-alkaline-earth-metals\/reactions-of-the-group-1-and-2-elements\/\">\n          <div class=\"ols-aqa322-card-img-wrap\">\n            <div class=\"ols-aqa322-visual ols-aqa322-visual--re\">\n              <div class=\"ols-aqa322-visual-panel\">\n                <div class=\"ols-aqa322-visual-kicker\">The elements<\/div>\n                <div class=\"ols-aqa322-visual-main\">Metal<br>Reactions<\/div>\n                <div class=\"ols-aqa322-config-line\" aria-hidden=\"true\"><span>oxygen, chlorine, water, acids<\/span><\/div>\n              <\/div>\n            <\/div>\n            <div class=\"ols-aqa322-card-num\">2<\/div>\n            <span class=\"ols-aqa322-card-status ols-aqa322-card-status--available\">Available<\/span>\n          <\/div>\n          <div class=\"ols-aqa322-card-body\">\n            <p class=\"ols-aqa322-card-title\">Reactions of the Group 1 and 2 Elements<\/p>\n            <p class=\"ols-aqa322-card-desc\">The reactions of the Group 2 elements with oxygen, chlorine, water, steam and dilute acids, with equations, observations and redox analysis.<\/p>\n            <span class=\"ols-aqa322-card-cta\">Start revising<svg viewBox=\"0 0 16 16\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M3 8h10M9 4l4 4-4 4\"><\/path><\/svg><\/span>\n          <\/div>\n        <\/a>\n\n        <!-- Card 3: Oxides, Hydroxides and Carbonates -->\n        <a class=\"ols-aqa322-card ols-aqa322-card--available\" href=\"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/aqa\/3-2-2-group-2-the-alkaline-earth-metals\/oxides-hydroxides-and-carbonates\/\">\n          <div class=\"ols-aqa322-card-img-wrap\">\n            <div class=\"ols-aqa322-visual ols-aqa322-visual--oh\">\n              <div class=\"ols-aqa322-visual-panel\">\n                <div class=\"ols-aqa322-visual-kicker\">Bases<\/div>\n                <div class=\"ols-aqa322-visual-main\">Oxides and<br>Hydroxides<\/div>\n                <div class=\"ols-aqa322-config-line\" aria-hidden=\"true\"><span>water, acids, pH, uses<\/span><\/div>\n              <\/div>\n            <\/div>\n            <div class=\"ols-aqa322-card-num\">3<\/div>\n            <span class=\"ols-aqa322-card-status ols-aqa322-card-status--available\">Available<\/span>\n          <\/div>\n          <div class=\"ols-aqa322-card-body\">\n            <p class=\"ols-aqa322-card-title\">Oxides, Hydroxides and Carbonates<\/p>\n            <p class=\"ols-aqa322-card-desc\">Group 2 oxides, hydroxides and carbonates: reactions with water and acids, pH trend, and uses of Ca(OH)\u2082, Mg(OH)\u2082 and CaCO\u2083.<\/p>\n            <span class=\"ols-aqa322-card-cta\">Start revising<svg viewBox=\"0 0 16 16\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M3 8h10M9 4l4 4-4 4\"><\/path><\/svg><\/span>\n          <\/div>\n        <\/a>\n\n        <!-- Card 4: Solubility Trends and the Sulfate Test -->\n        <a class=\"ols-aqa322-card ols-aqa322-card--available\" href=\"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/aqa\/3-2-2-group-2-the-alkaline-earth-metals\/solubility-trends-and-the-sulfate-test\/\">\n          <div class=\"ols-aqa322-card-img-wrap\">\n            <div class=\"ols-aqa322-visual ols-aqa322-visual--so\">\n              <div class=\"ols-aqa322-visual-panel\">\n                <div class=\"ols-aqa322-visual-kicker\">Opposite trends<\/div>\n                <div class=\"ols-aqa322-visual-main\">Solubility<br>Trends<\/div>\n                <div class=\"ols-aqa322-config-line\" aria-hidden=\"true\"><span>hydroxides up, sulfates down<\/span><\/div>\n              <\/div>\n            <\/div>\n            <div class=\"ols-aqa322-card-num\">4<\/div>\n            <span class=\"ols-aqa322-card-status ols-aqa322-card-status--available\">Available<\/span>\n          <\/div>\n          <div class=\"ols-aqa322-card-body\">\n            <p class=\"ols-aqa322-card-title\">Solubility Trends and the Sulfate Test<\/p>\n            <p class=\"ols-aqa322-card-desc\">Group 2 solubility trends: hydroxides and sulfates, Mg(OH)\u2082 and BaSO\u2084, the acidified barium chloride test for sulfate ions and barium meals.<\/p>\n            <span class=\"ols-aqa322-card-cta\">Start revising<svg viewBox=\"0 0 16 16\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M3 8h10M9 4l4 4-4 4\"><\/path><\/svg><\/span>\n          <\/div>\n        <\/a>\n\n        <!-- Card 5: Thermal Stability and Flame Colours -->\n        <a class=\"ols-aqa322-card ols-aqa322-card--available\" href=\"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/aqa\/3-2-2-group-2-the-alkaline-earth-metals\/thermal-stability-and-flame-colours\/\">\n          <div class=\"ols-aqa322-card-img-wrap\">\n            <div class=\"ols-aqa322-visual ols-aqa322-visual--ts\">\n              <div class=\"ols-aqa322-visual-panel\">\n                <div class=\"ols-aqa322-visual-kicker\">Heat and light<\/div>\n                <div class=\"ols-aqa322-visual-main\">Thermal<br>Stability<\/div>\n                <div class=\"ols-aqa322-config-line\" aria-hidden=\"true\"><span>polarisation and flame colours<\/span><\/div>\n              <\/div>\n            <\/div>\n            <div class=\"ols-aqa322-card-num\">5<\/div>\n            <span class=\"ols-aqa322-card-status ols-aqa322-card-status--available\">Available<\/span>\n          <\/div>\n          <div class=\"ols-aqa322-card-body\">\n            <p class=\"ols-aqa322-card-title\">Thermal Stability and Flame Colours<\/p>\n            <p class=\"ols-aqa322-card-desc\">Thermal stability of Group 1 and 2 nitrates and carbonates, polarisation by the cation, the experiments, and flame colours explained by electron transitions.<\/p>\n            <span class=\"ols-aqa322-card-cta\">Start revising<svg viewBox=\"0 0 16 16\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M3 8h10M9 4l4 4-4 4\"><\/path><\/svg><\/span>\n          <\/div>\n        <\/a>\n\n        <!-- Card 6: Tests for Ions -->\n        <a class=\"ols-aqa322-card ols-aqa322-card--available\" href=\"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/aqa\/3-2-2-group-2-the-alkaline-earth-metals\/tests-for-ions\/\">\n          <div class=\"ols-aqa322-card-img-wrap\">\n            <div class=\"ols-aqa322-visual ols-aqa322-visual--ti\">\n              <div class=\"ols-aqa322-visual-panel\">\n                <div class=\"ols-aqa322-visual-kicker\">Qualitative analysis<\/div>\n                <div class=\"ols-aqa322-visual-main\">Tests for<br>Ions<\/div>\n                <div class=\"ols-aqa322-config-line\" aria-hidden=\"true\"><span>CO\u2083\u00b2\u207b, SO\u2084\u00b2\u207b, halides, NH\u2084\u207a<\/span><\/div>\n              <\/div>\n            <\/div>\n            <div class=\"ols-aqa322-card-num\">6<\/div>\n            <span class=\"ols-aqa322-card-status ols-aqa322-card-status--available\">Available<\/span>\n          <\/div>\n          <div class=\"ols-aqa322-card-body\">\n            <p class=\"ols-aqa322-card-title\">Tests for Ions<\/p>\n            <p class=\"ols-aqa322-card-desc\">Tests for carbonate, hydrogencarbonate, sulfate, halide and ammonium ions, with ionic equations and the order of tests on an unknown.<\/p>\n            <span class=\"ols-aqa322-card-cta\">Start revising<svg viewBox=\"0 0 16 16\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M3 8h10M9 4l4 4-4 4\"><\/path><\/svg><\/span>\n          <\/div>\n        <\/a>\n\n      <\/div>\n    <\/div>\n  <\/section>\n\n  <!-- SPECIFICATION -->\n  <section class=\"ols-aqa322-spec-section\">\n    <div class=\"ols-aqa322-container\">\n      <div class=\"ols-aqa322-spec-wrap\">\n        <div class=\"ols-aqa322-spec-pill\">Specification Coverage<\/div>\n        <h2 class=\"ols-aqa322-spec-heading\">3.2.2 Group 2, the Alkaline Earth Metals &#8211; AQA A Level Chemistry<\/h2>\n        <p class=\"ols-aqa322-spec-intro-text\">The following AQA specification points outline the knowledge and skills students are expected to demonstrate. Wording follows the AQA A Level Chemistry (7405) specification.<\/p>\n        <h3 class=\"ols-aqa322-spec-group-title\">3.2.2 Group 2, the alkaline earth metals<\/h3>\n        <div class=\"ols-aqa322-spec-rows\">\n          <div class=\"ols-aqa322-spec-row ols-aqa322-spec-row--light\"><div class=\"ols-aqa322-spec-code\">i<\/div><div class=\"ols-aqa322-spec-text\">The trends in atomic radius and first ionisation energy of the elements Mg\u2013Ba, and their explanations.<\/div><\/div>\n          <div class=\"ols-aqa322-spec-row ols-aqa322-spec-row--mid\"><div class=\"ols-aqa322-spec-code ols-aqa322-spec-code--mid\">ii<\/div><div class=\"ols-aqa322-spec-text\">The trend in melting point of the elements Mg\u2013Ba, explained in terms of their structure and bonding.<\/div><\/div>\n          <div class=\"ols-aqa322-spec-row ols-aqa322-spec-row--light\"><div class=\"ols-aqa322-spec-code\">iii<\/div><div class=\"ols-aqa322-spec-text\">The reactions of the elements Mg\u2013Ba with water.<\/div><\/div>\n          <div class=\"ols-aqa322-spec-row ols-aqa322-spec-row--mid\"><div class=\"ols-aqa322-spec-code ols-aqa322-spec-code--mid\">iv<\/div><div class=\"ols-aqa322-spec-text\">The use of magnesium in the extraction of titanium from TiCl\u2084.<\/div><\/div>\n          <div class=\"ols-aqa322-spec-row ols-aqa322-spec-row--light\"><div class=\"ols-aqa322-spec-code\">v<\/div><div class=\"ols-aqa322-spec-text\">The relative solubilities of the hydroxides of the elements Mg\u2013Ba in water; Mg(OH)\u2082 is sparingly soluble.<\/div><\/div>\n          <div class=\"ols-aqa322-spec-row ols-aqa322-spec-row--mid\"><div class=\"ols-aqa322-spec-code ols-aqa322-spec-code--mid\">vi<\/div><div class=\"ols-aqa322-spec-text\">The use of Mg(OH)\u2082 in medicine and of Ca(OH)\u2082 in agriculture.<\/div><\/div>\n          <div class=\"ols-aqa322-spec-row ols-aqa322-spec-row--light\"><div class=\"ols-aqa322-spec-code\">vii<\/div><div class=\"ols-aqa322-spec-text\">The use of CaO or CaCO\u2083 to remove SO\u2082 from flue gases (taught on the 3.3.2 Alkanes pages).<\/div><\/div>\n          <div class=\"ols-aqa322-spec-row ols-aqa322-spec-row--mid\"><div class=\"ols-aqa322-spec-code ols-aqa322-spec-code--mid\">viii<\/div><div class=\"ols-aqa322-spec-text\">The relative solubilities of the sulfates of the elements Mg\u2013Ba in water; BaSO\u2084 is insoluble.<\/div><\/div>\n          <div class=\"ols-aqa322-spec-row ols-aqa322-spec-row--light\"><div class=\"ols-aqa322-spec-code\">ix<\/div><div class=\"ols-aqa322-spec-text\">The use of acidified BaCl\u2082 solution to test for sulfate ions, and the use of BaSO\u2084 in medicine.<\/div><\/div>\n          <div class=\"ols-aqa322-spec-row ols-aqa322-spec-row--mid\"><div class=\"ols-aqa322-spec-code ols-aqa322-spec-code--mid\">x<\/div><div class=\"ols-aqa322-spec-text\">Explain why BaCl\u2082 solution is used to test for sulfate ions and why it is acidified.<\/div><\/div>\n        <\/div>\n      <\/div>\n    <\/div>\n  <\/section>\n\n<script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@graph\": [\n    {\n      \"@type\": \"CollectionPage\",\n      \"@id\": \"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/aqa\/3-2-2-group-2-the-alkaline-earth-metals\/#webpage\",\n      \"url\": \"https:\/\/www.onlinelearningsystem.net\/xyz\/revision-notes\/a-level-chemistry\/aqa\/3-2-2-group-2-the-alkaline-earth-metals\/\",\n      \"name\": \"3.2.2 Group 2 | AQA A Level Chemistry | Online Learning System\",\n      \"description\": \"AQA A Level Chemistry 3.2.2 Group 2 revision notes: trends down groups 1 and 2, reactions of the group 1 and 2 elements, oxides, hydroxides and carbonates, solubility trends and the sulfate test, thermal stability and flame colours, tests for ions.\",\n      \"isPartOf\": {\n        \"@id\": \"https:\/\/www.onlinelearningsystem.net\/xyz\/#website\"\n      },\n      \"breadcrumb\": {\n        \"@id\": 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