Question:
Which of the following will precipitate first when an aqueous solution containing sulphate ions is added?
Which of the following will precipitate first when an aqueous solution containing sulphate ions is added?
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As we go down Group 2, the solubility of sulphates decreases. Barium sulphate (\({BaSO}_4\)) is the least soluble and precipitates first when sulphate ions are added.
Updated On: Mar 24, 2025
- \( {Mg}^{2+} \)
- \( {Ca}^{2+} \)
- \( {Sr}^{2+} \)
- \( {Ba}^{2+} \)
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The Correct Option is D
Solution and Explanation
Step 1: Understanding solubility trends. The precipitation of metal sulphates depends on their solubility product constant (\( K_{sp} \)). The lower the \( K_{sp} \) value, the less soluble the compound is, meaning it will precipitate first.
Step 2: Solubility of sulphates. The solubility order of alkaline earth metal sulphates (\({M}^{2+} {SO}_4^{2-}\)) decreases down the group: \[ {MgSO}_4>{CaSO}_4>{SrSO}_4>{BaSO}_4 \] Since barium sulphate (\({BaSO}_4\)) has the lowest solubility, it will precipitate first.
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