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Solubility Product

Write net ion...

Question

Write net ionic equations for the following qualitative analysis procedures:
(a) Precipitation of ${P b C l}_{2} (s)$ from a solution containing ${P b}^{2 +} (a q)$
(b) Dissolving of ${Z n (O H)}_{2} (s)$ in $N a O H (a q)$ .
(c) Dissolving of ${F e (O H)}_{3} (s)$ in $H C l (a q)$ .
(d) Precipitation of antimony sulphide from a solution containing $H_{2} S$ and the complex ion ${S b C l}_{4}^{-}$ .

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Solution

(a)Lead(II) ions react with chloride ions to form precipitate of lead dichloride.
${P b}^{2 +} (a q) + {2 C l}^{-} (a q) ⟶ {P b C l}_{2} (s) ↓$
(b) Zinc hydroide reacts with hydroxide ions to form soluble zincate ion.
${Z n (O H)}_{2} (s) + {2 O H}^{-} (a q) ⟶ {Z n O}_{2}^{2 -} (a q) + {2 H}_{2} O (l)$
(c)Ferric hydroxide on acidification gives Fe(III) ions.
${F e (O H)}_{3} (s) + {3 H}^{+} (a q) ⟶ {F e}^{3 +} (a q) + {3 H}_{2} O (l)$
(d)Hydrogen sulphide gas reacts with solution containing ${S b C l}_{4}^{-}$ to form a precipitate of antimony sulphide.
${2 S b C l}_{4}^{-} (a q) + {3 H}_{2} S (a q) ⟶ {S b}_{2} S_{3} (s) ↓ + {6 H}^{+} (a q) + {8 C l}^{-} (a q)$

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