Question

In: Chemistry

1. When 15.0 mL of a 5.22×10-4 M magnesium iodide solution is combined with 18.0 mL...

1. When 15.0 mL of a 5.22×10-4 M magnesium iodide solution is combined with 18.0 mL of a 5.89×10-4 M ammonium fluoride solution does a precipitate form?  (yes or no)

For these conditions the Reaction Quotient, Q, is equal to

1A. When 15.0 mL of a 4.09×10-4M potassium bromide solution is combined with 25.0 mL of a 1.59×10-4M silver nitrate solution does a precipitate form?  (yes or no)

For these conditions the Reaction Quotient, Q, is equal to

Solutions

Expert Solution

1)

concentration of MgI2 = 15.0 x 5.22 x 10^-4 / 15 + 18

                                    = 2.37 x 10^-4 M

concentration of NH4F = 18 x 5.89 x 10^-4 / 15 + 18

                                     = 3.21 x 10^-4 M

MgF2 ------------> Mg2+ +    2 F-

Q = [Mg2+][F-]^2

   = (2.37 x 10^-4) (3.21 x 10^-4 )^2

Q = 2.45 x 10^-11

Reaction quotient , Q = 2.45 x 10^-11

No , precipitate will not form

2)

reaction quotient = 1.52 x 10^-8

yes , precipitate will form

queen_honey_blossom answered 2 years ago
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