Chemistry: What is the molar solubility of calcium carbonate ( CaCO3 ) in water? The solubility-product constant for CaCO3 is 4.5 × 10-9 at 25 °C. A) 8.35 B) 9.5 × 10-5 C) 9.0 × 10-9 D) 2.3 × 10-9 E) 6.7 × 10-5

What is the molar solubility of calcium carbonate

melissalopez12

23.01.2022

Option E)

$6.7\times 10^{-5}M$

Explanation:

1. Write the solubility equation:

CaCO₃(s) ⇄ Ca²⁺(aq) + CO₃²⁻

2. Write the concentrations below the equation:

CaCO₃(s) ⇄ Ca²⁺(aq) + CO₃²⁻

A - s s s

3. Write the Ksp equation:

Ksp = [Ca²⁺] . [CO₃²⁻] ↔ the solid substances do not appearKsp = s × s4.5 × 10⁻⁹ = s²

4. Solve the equation:

$s=\sqrt{4.5\times 10^{-9}M^2}=6.7\times 10^{-5}M$

0,0(0 оценок)