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12. A)When 12.0 mL of a 9.60×10-4 M iron(III) acetate solution is combined with 18.0 mL...

12.

A)When 12.0 mL of a 9.60×10-4 M iron(III) acetate solution is combined with 18.0 mL of a 1.97×10-4 M sodium hydroxide solution does a precipitate form?  (yes or no)
For these conditions the Reaction Quotient, Q, is equal to?

B)When 15.0 mL of a 1.70×10-5M potassium phosphate solution is combined with 12.0 mL of a 5.97×10-4M lead acetate solution does a precipitate form?  (yes or no)
For these conditions the Reaction Quotient, Q, is equal to?

Solutions

Expert Solution

A)

concentration of Fe3+ = 12 x 9.60 x 10^-4 / 12 + 18

                                    = 3.84 x 10^-4 M

concentration of OH- = 18 x 1.97 x 10^-4 / 12 + 18

                                   = 1.182 x 10^-4 M

Fe(OH)3   ----------------> Fe3+ +   3 OH-

Q = [Fe3+][OH-]^3

   = (3.84 x 10^-4)( 1.182 x 10^-4)^3

Q = 6.34 x 10^-16

yes , precipitate will form

Reaction quotient Q = 6.34 x 10^-16

B)

concentration of PO43- = 9.44 x 10^-6 M

concentration of Pb2+ = 2.65 x 10^-4 M

Pb3(PO4)2 ----------------> 3 Pb2+ +   2 PO43-

Q = 1.66 x 10^-21

yes , precipitate will form

Q = 1.66 x 10^-21

queen_honey_blossom answered 2 years ago
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