Question

What reagent would you use for BaCl₂?
A) Na₂SO₄
B) H₂SO₄
C) NaOH
D) HCl

Answer 1

For precipitating Ba²⁺ from BaCl₂, sodium sulfate (Na₂SO₄) is used, which forms a solid precipitate of barium sulfate (BaSO₄). Therefore, the correct option is A.

Step-by-step explanation:

The reagent to use with BaCl₂ to precipitate the barium ion, Ba²⁺, is sodium sulfate (Na₂SO₄). When barium chloride reacts with sodium sulfate, a solid precipitate of barium sulfate (BaSO₄) is formed. The chemical reaction for this precipitation process would look like this:

BaCl₂ (aq) + Na₂SO₄ (aq) → BaSO₄ (s) + 2 NaCl (aq)

Here, BaSO₄ is the insoluble precipitate that can be filtered out from the solution.