Question

Several salts of lead are only slightly soluble in water. these are pbcl2, pbi2, pbs and pbco3. which of these would be more soluble in acid solution compared with water?

Answer 1

PbCl2 is more soluble in acid as compared to other salts of lead.

Four salts of lead are more soluble in acid solution than water.

$PbS$ ⇒ $Pb^{2+} + S^{2-}$

$2H^{+} + S^{2-}$  ⇒ $H_{2}S$

As $S^{2-}$ ions are removed from the solution by the formation of $H_{2} s$, the solubility of $PbS$ increases in acid solution.

$PbCo_{3}$ ⇒ $Pb^{2+} + Co_{3} ^{2-}$

$2H^{2+} + Co_{3} ^{2-}$  ⇒ $H_{2} Co_{3}$

   As $Co_{3}$ ions are removed from the solution by the formation of $H_{2} Co_{3}$, the solubility of $PbCo_{3}$ increases in acid solution.

$PbCl_{2}$ ⇒ $Pb^{2+} + 2Cl^{-}$

$2H^{+} + 2Cl^{-}$ ⇒$2HCl$

As $Cl^{-}$ ions are removed from the solution by the formation of HCl, the solubility of $PbCl_{2}$ increases in acid solution.

$PbI_{2}$ ⇒ $Pb^{2+} + 2I^{-}$

$2H^{+} + 2I^{-}$ ⇒ $2HI$

As $I^{-}$ are removed from the solution by the formation of $HI$, the solubility of $PbI_{2}$ increases in acid solution.

Thus from above we concluded that all the given salt of lead is more soluble in acid solution than in water.

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