Answer:
1.42 × 10⁻⁹ M
Explanation:
Step 1: Given data
- Concentration of Ba²⁺ ([Ba²⁺]): 0.0758 M
- Solubility product constant of BaSO₄ at 25°C: 1.08 × 10⁻¹⁰
Step 2: Write the reaction for the solution of BaSO₄
BaSO₄(s) ⇄ Ba²⁺(aq) + SO₄²⁻(aq)
Step 3: Calculate the concentration of SO₄²⁻
We will use the following expression.
Ksp = 1.08 × 10⁻¹⁰ = [Ba²⁺] × [SO₄²⁻]
[SO₄²⁻] = 1.08 × 10⁻¹⁰ / [Ba²⁺] = 1.08 × 10⁻¹⁰ / 0.0758 = 1.42 × 10⁻⁹ M
