Neco Model Questions Vol1 2022 Chemistry Question 14

Practice objective / multiple choice question 14 from the 2022 Neco Model Questions Vol1 Chemistry examination.

Neco Model Questions Vol1 2022 Chemistry Objective / Multiple Choice Medium Difficulty

Question 14 NECO_MODEL_QUESTIONS_VOL1 • 2022 • CHEMISTRY • objective

Equal volumes of \(0.010\) M \(\mathrm{Pb(NO_{3})_{2}}\) solution and \(0.020\) M potassium iodide (\(\mathrm{KI}\)) solution are mixed at \(25^{\circ}\mathrm{C}\). Lead(II) iodide (\(\mathrm{PbI_{2}}\)) precipitates according to \(\mathrm{Pb^{2+} + 2I^{-} \rightarrow PbI_{2}(s)}\). The solubility product of \(\mathrm{PbI_{2}}\) is \(K_{sp}=8.5 \times 10^{-9}\). (a) Calculate the mass of \(\mathrm{PbI_{2}}\) that precipitates per litre of the resulting mixture. (b) Determine the concentration of iodide ions remaining in solution after precipitation.

Answer Options

A. 2.10 g; 1.8 \times 10^{-3} M

B. 2.75 g; 2.0 \times 10^{-3} M

Correct Answer C. 2.31 g; 2.6 \times 10^{-3} M

D. 1.85 g; 3.2 \times 10^{-3} M

Correct Answer

Correct Option:

2.31 g; 2.6 \times 10^{-3} M

About This Question

This is Neco Model Questions Vol1 2022 Chemistry Question 14. It is one of the objective questions from the 2022 Neco Model Questions Vol1 Chemistry examination.

Difficulty level: Medium .

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