KVPY2014ChemistrySolid State
When 1.88 ~g of AgBr ( s ) is added to a 10⁻³ M aqueous solution of KBr , the concentration of Ag ⁺ is 5 10⁻¹⁰ M . if the same amount of AgBr ( s ) is added to a 10⁻² M aqueous solution of AgNO 3 , the concentration of Br is:
Options
- A9.4 10⁻⁹ M
- B5 10⁻¹⁰ M
- C1 10⁻¹¹ M
- D5 10⁻¹¹ M
Correct answer
D. 5 10⁻¹¹ M
Step-by-step solution
K _ SP AgBr = ( Ag ⁺ )( Br )= (5 10⁻¹⁰ ) (10⁻³ )=5 10⁻¹³ Concentration of Br in 10⁻² M aq AgNO ₃= Ksp AgBr [ Ag ⁺ ] = 5 10⁻¹³ (10⁻² ) =5 10⁻¹¹ ~m