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When 25.0 mL of a 2.72×10-4 M manganese(II) chloride solution is combined with 25.0 mL of...

When 25.0 mL of a 2.72×10-4 M manganese(II) chloride solution is combined with 25.0 mL of a 2.14×10-4 M potassium carbonate solution does a precipitate form? (yes/no)

AND For these conditions the Reaction Quotient, Q, is equal to: _____

Solutions

Expert Solution

concnetration of manganese(II) chloride = 25 x 2.72 x 10^-4 / 25 + 25

                                                                = 1.36 x 10^-4 M

concnetration of potassium carbonate = 25 x 2.14 x 10^-4 / 25 + 25

                                                              = 1.07 x 10^-4 M

MnCO3   -----------------> Mn+2   + CO32-

Q = [Mn+2][CO32-]

   = (1.36 x 10^-4 )(1.07 x 10^-4)

Q = 1.46 x 10^-8

Reaction Quotient, Q = 1.46 x 10^-8

Ksp of MnCO3 = 2.24×10–11

here Q > Ksp .

so precipitate forms.

queen_honey_blossom answered 2 years ago
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