Question

Strontium sulfate becomes less soluble in an aqueous solution when sodium sulfate is added becuase

Answer 1

A. The addition of sulfate ions shifts equilibrium to the left.

Step-by-step explanation:

Edge 2021

Answer 2

SrSO₄(s) ⇄ Sr²⁺(aq) + SO₄²⁻(aq)
Na₂SO₄(s) → 2Na⁺(aq) + SO₄²⁻(aq)

At increase the concentration of sulfate ions equilibrium of reaction is displaced towards formation of solid strontium sulfate. (Le Chatelier's principle).