Neco Model Questions Vol1 2017 Chemistry Question 45

Practice objective / multiple choice question 45 from the 2017 Neco Model Questions Vol1 Chemistry examination.

Neco Model Questions Vol1 2017 Chemistry Objective / Multiple Choice Medium Difficulty
Question 45 NECO_MODEL_QUESTIONS_VOL1 • 2017 • CHEMISTRY • objective

The solubility product of silver chloride is $K_{sp}=1.8\times10^{-10}$ at 25 °C and $K_{sp}=2.5\times10^{-10}$ at 35 °C. Assuming the enthalpy change $\Delta H^{\circ}$ for the dissolution is constant over this temperature range, (a) calculate $\Delta H^{\circ}$ (in kJ mol$^{-1}$) using the van\'t Hoff equation, and (b) estimate the solubility of AgCl at 45 °C.

Answer Options

A. ΔH°≈+25 kJ mol⁻¹; at 45 °C Ksp≈3.4×10⁻⁹ and solubility ≈5.7×10⁻⁵ M.
Correct Answer B. ΔH°≈+25 kJ mol⁻¹; at 45 °C Ksp≈3.4×10⁻¹⁰ and solubility ≈1.8×10⁻⁵ M.
C. ΔH°≈+35 kJ mol⁻¹; at 45 °C Ksp≈4.2×10⁻¹⁰ and solubility ≈2.2×10⁻⁵ M.
D. ΔH°≈+15 kJ mol⁻¹; at 45 °C Ksp≈2.9×10⁻¹⁰ and solubility ≈1.5×10⁻⁵ M.
Correct Answer
B
Correct Option:
ΔH°≈+25 kJ mol⁻¹; at 45 °C Ksp≈3.4×10⁻¹⁰ and solubility ≈1.8×10⁻⁵ M.

About This Question

This is Neco Model Questions Vol1 2017 Chemistry Question 45. It is one of the objective questions from the 2017 Neco Model Questions Vol1 Chemistry examination.

Difficulty level: Medium .

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