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Silver ions are added to the solution with Br − = Cl − = CO 3 2 − = AsO 4 3 − = 0 .1 M Which compound will precipitate at the lowest [ A g + ] ?

Options

  1. AAgBr;     (K sp   =   5   ×   10 − 13 )
  2. BAgCl;     ( K sp = 1.8 × 10 − 10 )
  3. CAg 2 CO 3 ;     ( K sp = 8.1 × 10 − 12 )
  4. DAg 3 AsO 4 ;     ( K sp = 10 − 22 )

Correct answer

A. AgBr;     (K sp   =   5   ×   10 − 13 )

Step-by-step solution

In case of AgBr , the ionic product will exceed the solubility product before AgCl , A g 2 C O 3 and A g 3 A s O 4 . Thus, AgBr will start precipitation before other salts.

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