A lab technician adds 0.015 mol of KOH to 1.00 L of 0.0010 M Ca(NO_3)2. Ksp = 6.

Question

A lab technician adds 0.015 mol of KOH to 1.00 L of 0.0010 M Ca(NO_3)2. Ksp = 6.5 times 10^-6 for Ca(OH)_2). Which of the following statements is correct? A) The presence of KOH will raise the solubility of Ca(N0_3)2. B) The concentration of calcium ions is reduced by the addition of the hydroxide ions. C) One must know Ksp for calcium nitrate to make meaningful predictions on this system. D) Calcium hydroxide precipitates until the solution is saturated. E) The solution is unsaturated and no precipitate forms.

Explanation / Answer

answer : option B ) the concentration of calcium ions is reduced by addition of hydroxide ions

Explanation :

Ca+2 +   2 OH- -------------> Ca(OH)2 (s)

if OH- ions are added then concentration of reactants increases. so the reaction shifts to rignt side that means product side . so the concentration of reactants decreases. and concentration of products increases.

so Ca+2 ions concentration decreases.

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