A Concentrated Buffer of PH 8

question 18

Multiple Choice

A concentrated buffer of pH 8.0 is added to an equal volume of a solution that is 0.080 M in each of the ions Zn²⁺, Ni²⁺, and Mn²⁺. The expected precipitate would consist of ________. salt: zinc hydroxide nickel hydroxide manganese hydroxide
Ksp 1.2 × 10^-17   2.0 × 10-¹⁵   1.9 × 10^-13

• A) Zn(OH)₂, Ni(OH)₂ and Mn(OH)₂
• B) Ni(OH)2 and Mn(OH)2
• C) Mn(OH)₂
• D) Ni(OH)₂ and Zn(OH)₂
• E) Zn(OH)₂

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