Question

what is solubility product? explain why cos is precipitated in alkaline medium whereas CdS is precipitated in acidic medium ​

Answer 1

Answer:

Explanation:

=> Solubility product : "It is product of concentration of ions raised to an exponent equal to co-efficient of the balanced equation."

 

A * By ⇄ Xa^{+y} + yB^{-X}

Al_2 S_3 ⇄ 2Al^{+3} + 3S^{-2}

K_c = [ A.y]^{x} [B^{-x}]^{y} / Ax * By

K_c * Ax * By =  [ A.y]^{x} [B^{-x}]^{y}  

Solubility product, Ksp =  [ A.y]^{x} [B^{-x}]^{y}  

=> cos is precipitated in alkaline medium whereas CdS is precipitated in acidic medium ​ because The concentration of the actual sulphide ion in the acidic solution is very lower.

=> It indicates that a fairly basic cation is necessary to respond to available hydrogen sulfide.

=> Copper (co) ions are more basic in nature as compare to cadmium ions, so it can react with hydrogen sulphide to remove hydrogen and produce insoluble CuS.

=> Cadmium is not basic and can not remove H atoms to make sulphide.