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A solution contains 1.43×10-2 M sodium hydroxide and 5.69×10-3 M potassium carbonate. Solid manganese(II) acetate is...

A solution contains 1.43×10-2 M sodium hydroxide and 5.69×10-3 M potassium carbonate.

Solid manganese(II) acetate is added slowly to this mixture.

A) What is the formula of the substance that precipitates first?

B) What is the concentration of manganese(II) ion when this precipitation first begins?  
[Mn2+] = ______ M

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Answer #1

Mangansese(II) acetate will react with sodium hydroxide to form a precipitate of mangansese(II) hydroxide Mn(OH)2.

Mangansese(II) acetate will react with sodium carbonate to form a precipitate of mangansese(II) carbonate MnCO3.

The solubility product of mangansese(II) carbonate MnCO3 and mangansese(II) hydroxide Mn(OH)2 are and respectively.

(A)
Mangansese(II) hydroxide Mn(OH)2 will precipitate first as it has lower value of the solubility product constant Ksp.

(B) When mangansese(II) hydroxide begins to precipitate

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