Consider an Aqueous Solution That Contains the Following Ions Each

question 38

Multiple Choice

Consider an aqueous solution that contains the following ions each with a concentration equal to 2.0×10 ^{- 12} M. [Zn²⁺] = 2.0×10 ^{- 12} M [Sn²⁺] = 2.0×10 ^{- 12} M [Cd²⁺] = 2.0×10 ^{- 12} M Which ion(s) will selectively precipitate if 5.0×10 ^{- 12} M Na₂S is added?
K _sp(ZnS) = 2.0×10 ^{- 22} K _sp(SnS) = 1.3×10 ^{- 23} K _sp(CdS) = 1.0×10 ^{- 24}

• A) Zn²⁺ only
• B) Zn²⁺ and Sn²⁺
• C) Sn²⁺ and Cd²⁺
• D) Cd²⁺ only
• E) All of these will precipitate

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