Determine solubility of AgBr in a 0.1 M KCN solution. [Kf. of [ Ag ( CN )2]-=5.6 × 108 ; K sp of .AgBr =7.7 × 10-13]

Question

Determine solubility of AgBr in a 0.1 M KCN solution. [Kf. of [ Ag ( CN )2]-=5.6 × 108 ; K sp of .AgBr =7.7 × 10-13] (A)  2× 103M  (B)  4× 10-6M  (C)  2× 10-6M  (D)  4× 10-3M

Tardigrade Admin · Accepted Answer

underset0.1-2 sAgBr +2 CN - leftharpoons undersetsAg ( CN )2- undersets+ Br - K sp =k sp ⋅ k=4.3 × 10-4 4.3 × 10-4=((s/0.1-2 s)) s=2 × 10-3

Q. Determine solubility of $A g B r$ in a $0.1 M K CN$ solution.
$[K_{f}$ of $[A g (CN)_{2}]^{-} = 5.6 \times 1 0^{8}; K_{s p}$ of $A g B r = 7.7 \times 1 0^{- 13}]$

$2 \times 1 0^{3} M$

$4 \times 1 0^{- 6} M$

$2 \times 1 0^{- 6} M$

$4 \times 1 0^{- 3} M$

$0.1 - 2 s A g B r + 2 C N^{-} ⇌ s A g (CN)_{2}^{-} s + B r^{-}$
$K_{s p} = k_{s p} \cdot k = 4.3 \times 1 0^{- 4}$
$4.3 \times 1 0^{- 4} = (\frac{s}{0.1 - 2 s})$
$s = 2 \times 1 0^{- 3}$

Q. Determine solubility of AgBr in a 0.1MKCN solution. [Kf​ of [Ag(CN)2​]−=5.6×108;Ksp​ of AgBr=7.7×10−13]

2×103M

4×10−6M

2×10−6M

4×10−3M