The sulphide ion concentration [S^{2-}] in a | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(B) Precipitation occurs when the ionic product $(Q_{sp})$ exceeds the solubility product $(K_{sp})$. In the presence of dilute $HCl$,the concentratio

Vedclass · Accepted Answer

$III, IV$

Vedclass · Answer

(B) Precipitation occurs when the ionic product $(Q_{sp})$ exceeds the solubility product $(K_{sp})$. In the presence of dilute $HCl$,the concentration of $S^{2-}$ ions is suppressed due to the common ion effect of $H^{+}$ ions. Given $[S^{2-}] = 1 	imes 10^{-22} \ M$. For a metal sulphide $(MS)$ to precipitate,the condition is $Q_{sp} > K_{sp}$,where $Q_{sp} = [M^{2+}][S^{2-}]$. Assuming a typical metal ion concentration of $0.1 \ M$,the ionic product $Q_{sp} = 0.1 	imes 10^{-22} = 10^{-23}$. Comparing the given $K_{sp}$ values: $I: 1.74 	imes 10^{-16} > 10^{-23}$ (No precipitation) $II: 1.2 	imes 10^{-22} > 10^{-23}$ (No precipitation) $III: 8.2 	imes 10^{-46} $IV: 5.0 	imes 10^{-34} Thus,sulphides $(III)$ and $(IV)$ will precipitate.

Product	Sulphide Solubility $(K_{sp})$
$I$	$1.74 \times 10^{-16}$
$II$	$1.2 \times 10^{-22}$
$III$	$8.2 \times 10^{-46}$
$IV$	$5.0 \times 10^{-34}$

Similar Questions

The solubility product of $PbS$ is $3.4 \times 10^{-28}$. If $[Pb^{2+}] = 1 \times 10^{-2} \ mol/L$,what concentration of $[S^{2-}]$ is required to precipitate $PbS$?

Calculate the solubility in $mol \ dm^{-3}$ of sparingly soluble salt $BA$ if its solubility product is $4.9 \times 10^{-13}$ at the same temperature.

The solubility product of a sparingly soluble salt $AX_2$ is $3.2 \times 10^{-11}$. Its solubility (in moles/litres) is

$A_{3}B_{2}$ is a sparingly soluble salt of molar mass $M \ g \ mol^{-1}$ and solubility $x \ g \ L^{-1}$. The solubility product satisfies $K_{sp} = a(\frac{x}{M})^{5}$. The value of $a$ is ...... . (Integer answer)

Which compound is soluble in $NH_4OH$?

Vedclass Test Series

Exam Paper Generator

Online Exam Module