What is the maximum amount of sodium sulfate that can be added to 1.00 L of 0.0020 M Ca(NO₃)₂before precipitation of calcium sulfate begins? K_sp = 2.4 × 10⁻⁵ for calcium sulfate. A)1.2 × 10 ⁻² mol B)4.9 × 10 ⁻³ mol C)3.5 × 10 ⁻³ mol D)1.2 × 10 ⁻⁵ mol E)4.8 × 10 ⁻⁸ mol

Question

Quizplus · Accepted Answer

The correct answer is A because the maximum amount of sodium sulfate that can be added to 1.00 L of 0.0020 M Ca(NO3)2 before precipitation of calcium sulfate begins is 1.2 × 10-2 mol. This is because the Ksp for calcium sulfate is 2.4 × 10-5, which means that the concentration of Ca2+ and SO42- ions in solution must be less than this value in order to prevent precipitation. The addition of sodium sulfate will increase the concentration of SO42- ions in solution, which will in turn decrease the concentration of Ca2+ ions. This will eventually lead to precipitation of calcium sulfate when the Ksp is exceeded.

What Is the Maximum Amount of Sodium Sulfate That Can