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Grade: Upto college level
        

A solution is 0.1M in Cl- and 0.1M in CrO4-- ions. If solid AgNO3 is gradually added to this solution which one will precipitate first? At what concentration of Cl-, Ag2CrO4 starts precipitating? (Ksp of AgCl= 1.7x10-19, Ksp of Ag2CrO4 = 1.9x10-12).

8 years ago

Answers : (1)

SAGAR SINGH - IIT DELHI
879 Points
							

Dear student,

  • Solubility Product, Ksp, refers to an ionic compound dissolving to form ions
  • For the reaction: MA(s) M+(aq) + A-(aq)

    The equilibrium constant K is:

    K = [M+][A-]

    [MA]

     

  • Since the concentration of the solid is a constant, it is effectively incorporated into the equilibrium constant: Ksp = [M+][A-]
  • [M+][A-] is referred to as the ion product.
  • At equilibrium, the ion product = solubility product (Ksp) and the solution is said to be saturated.
  • A precipitate will form when two solutions are mixed if the ion product is greater than the solubility product, ie, [M+][A-] > Ksp

 

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Askiitians Expert

Sagar Singh

B.Tech, IIT Delhi

8 years ago
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