When 15.0 mL of a 7.51×10-4 M copper(II) chloride solution is combined with 25.0 mL of...

When 15.0 mL of a 7.51×10-4 M copper(II) chloride solution is combined with 25.0 mL of a 7.16×10-4 M ammonium sulfide solution does a precipitate form? (yes or no) For these conditions the Reaction Quotient, Q, is equal to .

Expert Solution

total volume = 15 + 25 = 40 mL

CuCl2 molarity in the mixture = millimoles / total volume

= 15 x 7.51 x 10^-4 / 40

= 2.82 x 10^-4 M

(NH4)2S molarity in the mixture = 25 x 7.16 x 10^-4 / 40

= 4.48 x 10^-4 M

Q = [Cu2+][S2-]

Q = (2.82 x 10^-4) ( 4.48 x 10^-4)

Q = 1.26 x 10^-7 (answer)

Ksp = 7.9 x 10^-37

Q > Ksp . so precipitate will for . answer . YES

queen_honey_blossom answered 2 years ago

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