Which of the following statements concerning the separation of metal ions into A

Question

Which of the following statements concerning the separation of metal ions into Analytical Groups I-V is/are correct?

3.The formation of a precipitate with the addition of dilute HCl(aq) indicates the original solution contains all of the ions of Analytical Group I (the ions which precipitate as chlorides).

1 only

2 only

3 only

1 and 2

1, 2, and 3

1. Only the least soluble sulfides will precipitate in an acidic solution of H2S. 2. K+ and Na+ are precipitated in the last step of the separation scheme.

3.The formation of a precipitate with the addition of dilute HCl(aq) indicates the original solution contains all of the ions of Analytical Group I (the ions which precipitate as chlorides).

1 only

2 only

3 only

1 and 2

1, 2, and 3

Explanation / Answer

Solution.

1. Only the least soluble sulfides will precipitate in an acidic solution of H2S. This statement is true, because sulfides like Na2S or K2S are very well soluble in H2S. The original statement is true.

2. K+ and Na+ are precipitated in the last step of the separation scheme from the solution of filtrate from carbonate or phosfate precipitation. The original statement is true.

3. The Analytical Group I includes Ag+, Hg22+ and Pb2+. The addition of dilute HCl(aq) indicates the original solution contains at least one of the ions of Analytical Group I . - The original statement is false.

Therefore, the statements 1 and 2 are true.

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