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Question

The concentrations of Cl&CrO24 in a solution are 0.1M&104M respectively.  If solid AgNO3 is gradually 
added to this solution, what will be the concentration of  Cl when Ag2CrO4 begins to precipitate? [Ksp(AgCl)=1010M2;Ksp(Ag2CrO4)=1012M3]


  1. 106M
  2. 104M
  3. 109M
  4. 105M


Solution

The correct option is A 106M
Ag2CrO4(s)2Ag++CrO24kspAg2CrO4=[Ag+]2[CrO24]1012=[Ag+]2[104][Ag+]=104MAgCl(s)Ag++ClkspAgCl=[Ag+][Cl]1010=[104][Cl][Cl]=106M

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