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When 12.0 mL of a 2.25×10-4 M chromium(III) nitrate solution is combined with 22.0 mL of...

When 12.0 mL of a 2.25×10-4 M chromium(III) nitrate solution is combined with 22.0 mL of a 1.80×10-5 M potassium hydroxide solution does a precipitate form? (yes/no)

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

Solutions

Expert Solution

concentration of chromium (III) nitrate = 12 x 2.25 x 10^-4 / 12 + 22

                                                            = 7.94 x 10^-5 M

concentration of KOH = 1.80 x 10^-5 x 22 / 22 + 12

                                   = 1.165 x 10^-5 M

Cr(OH)3   ----------------> Cr+3 +   3 OH-

Q = [Cr+3][OH-]^3

     = (7.94 x 10^-5) (1.165 x 10^-5)^3

Q = 1.25 x 10^-19

Ksp of Cr(OH)3 = 3×10–29

here Q > Ksp .

so the precipitate forms.

reaction quotient Q = 1.25 x 10^-19

queen_honey_blossom answered 2 years ago
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