Neco 2025 Chemistry Question 25

Practice objective / multiple choice question 25 from the 2025 Neco Chemistry examination.

Neco 2025 Chemistry Objective / Multiple Choice Medium Difficulty

Question 25 NECO • 2025 • CHEMISTRY • objective

At 25^{\circ}C the solubility product of CaSO_{4} is K_{sp}=2.4\times10^{-5}. The solubility of CaSO_{4} in pure water at this temperature is 0.067 g per 100 mL. A 1.00 L sample of this saturated solution is then mixed with 0.10 mol of Na_{2}SO_{4}. Assuming the temperature remains at 25^{\circ}C and the volume change is negligible, calculate the final concentration of Ca^{2+} ions in the solution (in mol·L^{-1}, give your answer to two significant figures).

A. 3.5\times10^{-4} mol·L^{-1}

B. 1.2\times10^{-4} mol·L^{-1}

C. 2.3\times10^{-3} mol·L^{-1}

Correct Answer D. 2.3\times10^{-4} mol·L^{-1}

Correct Answer

Correct Option:

2.3\times10^{-4} mol·L^{-1}

This is Neco 2025 Chemistry Question 25. It is one of the objective questions from the 2025 Neco Chemistry examination.

Difficulty level: Medium .

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