Describe the trend in the solubility of the hydroxides of magnesium, calcium and strontium. ....................................................................................................................................... . (ii) Suggest the variation in pH of saturated solutions of the hydroxides of magnesium, calcium and strontium. Explain your answer. ....................................................................................................................................... . ....................................................................................................................................... . .................................................................................................................................

Chemistry

IGCSE&ALevel

CAIE

Exam No：9701_s24_qp_41 Year：2024 Question No：1(a)

Answer:

Knowledge points:

10.1.1 describe, and write equations for, the reactions of the elements with oxygen, water and dilute hydrochloric and sulfuric acids

10.1.2 describe, and write equations for, the reactions of the oxides, hydroxides and carbonates with water and dilute hydrochloric and sulfuric acids

10.1.3 describe, and write equations for, the thermal decomposition of the nitrates and carbonates, to include the trend in thermal stabilities

10.1.4 describe, and make predictions from, the trends in physical and chemical properties of the elements involved in the reactions in 10.1.1 and the compounds involved in 10.1.2, 10.1.3 and 10.1.5

10.1.5 state the variation in the solubilities of the hydroxides and sulfates

23.2.1 define and use the term enthalpy change with reference to hydration, and solution, Δ$\mathrm{H}_{sol}$

23.2.2 construct and use an energy cycle involving enthalpy change of solution, lattice energy and enthalpy change of hydration

23.2.3 carry out calculations involving the energy cycles in 23.2.2

23.2.4 explain, in qualitative terms, the effect of ionic charge and of ionic radius on the numerical magnitude of an enthalpy change of hydration

Answer:

Knowledge points:

Solution:

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