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).

Dear student,

• Solubility Product, K_sp, 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: K_sp = [M⁺][A^-]
• [M⁺][A^-] is referred to as the ion product.
• At equilibrium, the ion product = solubility product (K_sp) 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^-] > K_sp

Please feel free to ask your queries here. We are all IITians and here to help you in your IIT JEE preparation.

All the best.

Win exciting gifts by answering the questions on Discussion Forum. So help discuss any query on askiitians forum and become an Elite Expert League askiitian.

Now you score 5+15 POINTS by uploading your Pic and Downloading the Askiitians Toolbar  respectively : Click here to download the toolbar..

Askiitians Expert

Sagar Singh

B.Tech, IIT Delhi