CAIE A-Level Chemistry 23.2.1 Hydration and Solution Enthalpies
Practise stating precise definitions and equations for hydration and solution enthalpy changes.
- Syllabus
- 2028–2030
- Course
- Chemistry 9701
- Level
- A2
Exam points
- define ΔHhyd for one mole of gaseous ions forming aqueous ions under standard conditions
- define ΔHsol for one mole of solute dissolving to form a solution of infinite dilution
- write equations with one-mole stoichiometry and correct gaseous, solid and aqueous state symbols
23.2.1—Hydration and solution enthalpies question 1
[Maximum number: 1]
Potassium iodide, KI, is used as a reagent in both inorganic and organic chemistry.
KI forms an ionic lattice that is soluble in water.
Define enthalpy change of solution, ΔHsol .
(enthalpy change when) one mole of a substance / solute
AND dissolves in water / turns into an aqueous solution
(to form a solution of infinite dilution)
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