An Aqueous Solution Contains [Ba²⁺] = 5

question 91

Multiple Choice

An aqueous solution contains [Ba²⁺] = 5.0 × 10^-5 M,[Ag⁺] = 3.0 × 10^-5 M,and [Zn²⁺] = 2.0 × 10^-7 M.Sodium oxalate is slowly added so that [C₂O₄^2-] increases.
Salt BaC₂O₄ ZnC₂O₄ Ag₂C₂O₄
K_sp 1.5 × 10^-8 1.35 × 10^-9 1.1 × 10^-11
What is the concentration of the first cation to precipitate when the second cation just begins to precipitate?

• A)1.3 × 10^-6 M
• B)2.2 × 10^-6 M
• C)5.0 × 10^-5 M
• D)1.35 × 10^-9 M
• E)1.1 × 10^-11 M

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