Reactions of lead dioxide with concentrated hydrochloric acid.

Reactions of lead dioxide with concentrated hydrochloric acid.

(a) Lead dioxide reacts with cold concentrated hydrochloric acid to form  lead (IV) chloride

PbO₂ (s) + 4 HCl (aq) (conc. and cold)  → PbCl₄(aq) +2H₂O(l)

(b) Lead dioxide oxidizes hot concentrated hydrochloric acid to chlorine (a green gas is observed)

PbO₂(s) + 4HCl(aq) → PbCl₂ (s) + 2H₂O(l) + Cl₂(g)

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