Question

Can you us3 HCl to separate lead (Pb²) from silver (Ag)? How about H2S?

Answer 1

Answer:

Explanation:

After dissolving galena in HNO3, adding HCl will precipitate BOTH silver chloride and lead chloride. Thre lead chloride can be leached out by filtering the precipitate off and boiling it in water and discarding the solution. ... Silver chloride is essentially insoluble in hot water, lead chloride is fairly soluble.

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.