Gce Model Questions Vol1 2024 Chemistry Question 36

Practice objective / multiple choice question 36 from the 2024 Gce Model Questions Vol1 Chemistry examination.

Gce Model Questions Vol1 2024 Chemistry Objective / Multiple Choice Medium Difficulty
Question 36 GCE_MODEL_QUESTIONS_VOL1 • 2024 • CHEMISTRY • objective

At 25\,\degreeC the solubility of Fe(OH)_{3} in pure water is \(2.0\times10^{-4}\ \text{mol\ L}^{-1}\). At 35\,\degreeC the solubility increases to \(3.2\times10^{-4}\ \text{mol\ L}^{-1}\). (i) Calculate the solubility product \(K_{sp}\) at each temperature. (ii) Assuming the enthalpy change \(\Delta H^{\circ}\) for the dissolution is constant over this temperature range, estimate \(\Delta H^{\circ}\) using the van\'t Hoff equation.

Answer Options

A. K_{sp}(25\,\degreeC)=5.0\times10^{-14}, K_{sp}(35\,\degreeC)=3.5\times10^{-13}, \Delta H^{\circ}\approx+2.0\times10^{5}\ \text{J\ mol}^{-1}
Correct Answer B. K_{sp}(25\,\degreeC)=4.3\times10^{-14}, K_{sp}(35\,\degreeC)=2.8\times10^{-13}, \Delta H^{\circ}\approx+1.4\times10^{5}\ \text{J\ mol}^{-1}
C. K_{sp}(25\,\degreeC)=4.3\times10^{-15}, K_{sp}(35\,\degreeC)=2.8\times10^{-14}, \Delta H^{\circ}\approx+1.4\times10^{6}\ \text{J\ mol}^{-1}
D. K_{sp}(25\,\degreeC)=2.1\times10^{-14}, K_{sp}(35\,\degreeC)=1.6\times10^{-13}, \Delta H^{\circ}\approx+9.0\times10^{4}\ \text{J\ mol}^{-1}
Correct Answer
B
Correct Option:
K_{sp}(25\,\degreeC)=4.3\times10^{-14}, K_{sp}(35\,\degreeC)=2.8\times10^{-13}, \Delta H^{\circ}\approx+1.4\times10^{5}\ \text{J\ mol}^{-1}

About This Question

This is Gce Model Questions Vol1 2024 Chemistry Question 36. It is one of the objective questions from the 2024 Gce Model Questions Vol1 Chemistry examination.

Difficulty level: Medium .

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