explain the role of addition of dil HCl before H2S gas for precipitation of group 2 cations
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The concentration of sulphide ions is suppressed by HCl due to common ion effect. The already present H+ ions suppress the dissociation of H2S by moving the reaction in the backward reaction. Hence a lesser no of sulphide ions is produced so that only those cations are precipitated having lower solubility product.
Answered by
1
Explanation:
The concentration of sulphide ions is suppressed by HCl due to common ion effect. The already present H+ ions suppress the dissociation of H2S by moving the reaction in the backward reaction. Hence a lesser no of sulphide ions is produced so that only those cations are precipitated having lower solubility product.
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