1. Solid silver nitrite is slowly added to 75.0 mL of a potassium chromate solut

Question

1. Solid silver nitrite is slowly added to 75.0 mL of a potassium chromate solution until the concentration of silver ion is 0.0680 M. The maximum amount of chromate remaining in solution is ________ M.

2. Solid sodium carbonate is slowly added to 125 mL of a 0.406 M magnesium nitrite solution until the concentration of carbonate ion is 0.0368 M. The percent of magnesium ion remaining in solution is _______ %.

3.Solid potassium cyanide is slowly added to 125 mL of a 0.0606 M nickel(II) acetate solution. The concentration ofcyanide ion required to just initiate precipitation is ______ M.

4.Solid barium nitrate is slowly added to 125 mL of a 0.0526 M sodium sulfite solution. The concentration of bariumion required to just initiate precipitation is ________ M.

Explanation / Answer

The concentration data and Ksp are missing ....i am solving 2-3 parts and taking ksp own my ...but initial concentration should be given.

1) Cannot be solved without concentration of Chromate

2) Ksp of MgCO3 = 6.8 x10-6   not given

Ksp = [Mg+2] [CO3-2] = 6.8 x10-6

     [Mg+2]left = (6.8 x10-6)/0.0368 = 1.847x 10-4 M

   % Mg which is unPPT = 100 x [(0.406 M -1.847x 10-4 M)/0.406 ] = 0.4058x100/0.406= 99.9545%

3) Ni(CN)2 does not form PPt

4) Ksp of BaSO3 = 8 x 10-7 not given in question

   Ksp of BaSO3 = 8 x 10-7 = [Ba+2 ][SO3-2]

                       8 x 10-7 = [Ba+2 ][0.0526 M]

                 [Ba+2 ] = 8 x 10-7/[0.0526 M] = 1.52x10-5 M

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