The Cu 2+ ion can be separated from Ag + ,Ca 2+ ,and K + in aqueous solution by

Cu 2+ can be selectively precipitated as CuS(s) at pH-1, while Ag + , Ca 2+ , and K + will remain in solution. This is because CuS has a lower solubility product constant than the other metal sulfides at low pH.

The Cu 2+ ion can be separated from Ag + ,Ca 2+ ,and K + in aqueous solution by

Cu 2+ can be selectively precipitated as CuS(s) at pH-1, while Ag + , Ca 2+ , and K + will remain in solution. This is because CuS has a lower solubility product constant than the other metal sulfides at low pH.

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The Cu²⁺ Ion Can Be Separated from Ag⁺,Ca²⁺,and K⁺ in Aqueous

Question 71

Multiple Choice

The Cu²⁺ ion can be separated from Ag⁺,Ca²⁺,and K⁺ in aqueous solution by

A) precipitation of Cu²⁺ as CuS(s) at pH-1.
B) precipitation of Cu²⁺ as Cu(OH) ₂(s) with 6 M NaOH(aq) .
C) precipitation of Cu²⁺ as CuCl₂(s) with 6 M HCl(aq) .
D) precipitation of Ag⁺,Ca²⁺,and K⁺ as the carbonates.
E) None of these procedures will separate Cu²⁺ from the other ions.