When 25.0 mL of a 5.41×10-4 M manganese(II) acetate solution is combined with 12.0 mL of...
When 25.0 mL of a 5.41×10-4 M manganese(II) acetate solution is combined with 12.0 mL of a 7.59×10-4 M potassium hydroxide solution does a precipitate form? (yes or no)
For these conditions the Reaction Quotient, Q, is equal to----?
Homework Answers
It has the precipitate formation reaction:
Mn + 2 + 2 OH- = Mn (OH) 2
The concentration of reactive ions in solution is calculated:
[Mn + 2] = 5.41x10 ^ -4 M * 25 mL / 37 mL = 3.66x10 ^ -4 M
[OH-] = 7.59x10 ^ -4 M * 12 mL / 37 mL = 2.46x10 ^ -4 M
The quotient Q is calculated:
Q = [Mn + 2] * [OH -] ^ 2 = (3.66x10 ^ -4) * (2.46x10 ^ -4) ^ 2 = 2.21x10 ^ -11
You have to Qsp> Ksp, therefore if precipitate occurs.
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