Two white solids, CaCO₃ and BaCO₃, are obtained in an analysis. What tests will you perform to determine which is BaCO₃?

• A. Dissolve the two white solids in an acetic acid solution. Add potassium chromate to form chromate salts. If a yellow precipitate forms, the solution contains Ba²⁺. To confirm presence of Ba²⁺, dissolve the yellow precipitate in concentrated HCl and evaporate to dryness. Apply flame test. A yellow-green flame confirms the presence of Ba²⁺.
• B. Dissolve the two white solids in an acetic acid solution. Add potassium chromate to form chromate salts. If a white precipitate forms, the solution contains Ba²⁺. To confirm presence of Ba²⁺, dissolve the white precipitate in concentrated HCl and evaporate to dryness. Apply flame test. A red flame confirms the presence of Ba²⁺.
• C. Dissolve the two white solids in a nitric acid solution. Add potassium chromate to form chromate salts. If a white precipitate forms, the solution contains Ba²⁺. To confirm presence of Ba²⁺, apply flame test. A blue flame confirms the presence of Ba²⁺.
• D. Dissolve the two white solids in a carbonic acid solution. Add potassium chromate to form chromate salts. If a yellow precipitate forms, the solution contains Ba²⁺. To confirm presence of Ba²⁺, apply flame test. A yellow flame confirms the presence of Ba²⁺.

Answer: (A)