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OCR A Level Chemistry A – Module 2 Foundations in Chemistry

2.1.4
Acids

Section 2.1.4 covers the common acids and alkalis, strong and weak acids, neutralisation, preparing standard solutions, carrying out titrations and titration calculations. These pages cover the typical reactions of acids; acids and alkalis, titration technique and titration calculations follow with the supplementary set.

Exam Paper
Paper 1
H432/01
Specification Points
2.1.4 (a) – (e)
5 learning outcomes
Topic Parts
1 of 4 live
Typical Reactions of Acids
Exam Board
OCR A
H432 (2015 onwards)

Revision Notes

Work through 2.1.4 in a structured sequence.

Neutralisation
Reactions
of Acids
1

Typical Reactions of Acids

Acids with metals, metal oxides, hydroxides, carbonates and alkalis, with full and ionic equations (2.1.4 (c)).

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Dissociation
Acids and
Alkalis
2

Acids and Alkalis

The common acids and alkalis, H⁺ and OH⁻ release in solution, and strong versus weak acids by dissociation (2.1.4 (a), (b)).

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Technique
Standard
Solutions
3

Standard Solutions and Titration Technique

Preparing a standard solution in a volumetric flask and carrying out an accurate acid-base titration (2.1.4 (d)).

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Volumetric
Titration
Calculations
4

Titration Calculations

Structured and unstructured titration calculations from experimental results (2.1.4 (e)). Page being prepared.

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Specification Coverage

2.1.4 Acids – OCR A Level Chemistry A

The following OCR A learning outcomes state what candidates should be able to do. Wording is taken from the OCR A Level Chemistry A (H432) specification.

2.1.4 Acids

2.1.4(a)
Acids and alkalis
i
the formulae of the common acids (HCl, H2SO4, HNO3 and CH3COOH)
ii
the formulae of the common alkalis (NaOH, KOH and NH3)
iii
explanation that acids release H+ ions in aqueous solution
iv
explanation that alkalis release OH– ions in aqueous solution
2.1.4(b)
Strong and weak acids
i
qualitative explanation of strong acids in terms of relative dissociation
ii
qualitative explanation of weak acids in terms of relative dissociation
2.1.4(c)
Neutralisation
i
neutralisation as the reaction of H+ and OH– to form H2O
ii)-a
neutralisation as the reaction of acids with carbonates to form salts, including full equations
ii)-b
neutralisation as the reaction of acids with metal oxides to form salts, including full equations
ii)-c
neutralisation as the reaction of acids with alkalis (water-soluble bases) to form salts, including full equations
2.1.4(d)
Standard solutions and titrations
i
the techniques and procedures used when preparing a standard solution of required concentration
ii
the techniques and procedures used when carrying out acid–base titrations
2.1.4(e)
Titration calculations
i
structured titration calculations, based on experimental results of familiar and non-familiar acids and bases
ii
non-structured titration calculations, based on experimental results of familiar and non-familiar acids and bases