One step in qualitative analysis differentiates acid-soluble sulfides from acid-

Question

One step in qualitative analysis differentiates acid-soluble sulfides from acid-insoluble sulfides by adding H2S(aq) in 0.2 M HCl and looking for a precipitate. Which of the following statements about this step is true?

(a) The acid-insoluble sulfides are precipitated.

(b) The acid-soluble sulfides are precipitated.

(c) The cation precipitates as its acid salt.

(d) The anion precipitates as its acid salt.

(e) More than one of the above statements is true.

(f) None of the above statements is true.

Explanation / Answer

In cation analysis, some metal cations are separated as sulfide precipitates by adding H2S in the presence of acid.

Therefore, the true statement is (a) The acid-insoluble sulfides are precipitated.

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