Topic 27
Group 2
Topic 27 returns to Group 2 at A Level with two explanations: the trend in the thermal stability of the nitrates and carbonates in terms of ionic radius and the polarisation of the large anion by the cation (27.1.1), and the variation in the solubility of the hydroxides and sulfates, and their enthalpy changes of solution, in terms of the relative sizes of the lattice energy and the enthalpy change of hydration (27.1.2). The AS chemistry of the group is in Topic 10.
Revision Notes
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Thermal Stability of Group 2 Nitrates and Carbonates
The thermal stability of Group 2 nitrates and carbonates explained by cation charge density and anion polarisation.
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Solubility of Group 2 Hydroxides and Sulfates
The solubility trends of Group 2 hydroxides and sulfates explained by lattice energy, hydration enthalpy and enthalpy of solution.
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27.1.1
- a
describe and explain qualitatively the trend in the thermal stability of the nitrates including the effect of ionic radius on the polarisation of the large anion
Revise - b
describe and explain qualitatively the trend in the thermal stability of the carbonates including the effect of ionic radius on the polarisation of the large anion
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27.1.2
- a
describe and explain qualitatively the variation in solubility of the hydroxides and sulfates in terms of relative magnitudes of the enthalpy change of hydration and the lattice energy
Revise - b
describe and explain qualitatively the variation in enthalpy change of solution, ΔHsol, of the hydroxides and sulfates in terms of relative magnitudes of the enthalpy change of hydration and the lattice energy
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