Question

Đã trả lời bởi chuyên gia

Answer 1

a) $\overset{+ 1}{H} \overset{- 1}{C l} + \overset{+ 4}{P b} {\overset{- 2}{O}}_{2} \to \overset{+ 2}{P b} {\overset{- 1}{C l}}_{2} + {\overset{0}{C l}}_{2} + {\overset{+ 1}{H}}_{2} \overset{- 2}{O}$

$\begin{array}{l} \overset{+ 4}{P b} + 2 e \to \overset{+ 2}{P b} \\ \overset{- 1}{C l} \to \overset{0}{C l} + 1 e \end{array}$

$\begin{matrix} 1 \times \\ 2 \times \end{matrix} |\begin{array}{l} \overset{+ 4}{P b} + 2 e \to \overset{+ 2}{P b} \\ \overset{- 1}{C l} \to \overset{0}{C l} + 1 e \end{array}$

⇒ $\overset{+ 4}{P b} + 2 \overset{- 1}{C l} \to \overset{+ 2}{P b} + 2 \overset{0}{C l}$

4HCl + PbO₂ → PbCl₂ + Cl₂ + 2H₂O

b) $\overset{+ 1}{K} \overset{+ 7}{M n} {\overset{- 2}{O}}_{4} + \overset{+ 1}{H} \overset{- 1}{C l} \to \overset{+ 1}{K} \overset{- 1}{C l} + \overset{+ 2}{M n} {\overset{- 1}{C l}}_{2} + {\overset{0}{C l}}_{2} + {\overset{+ 1}{H}}_{2} \overset{- 2}{O}$

$\begin{array}{l} \overset{+ 7}{M n} + 5 e \to \overset{+ 2}{M n} \\ \overset{- 1}{C l} \to \overset{0}{C l} + 1 e \end{array}$

$\begin{matrix} 1 \times \\ 5 \times \end{matrix} |\begin{array}{l} \overset{+ 7}{M n} + 5 e \to \overset{+ 2}{M n} \\ \overset{- 1}{C l} \to \overset{0}{C l} + 1 e \end{array}$

⇒ $\overset{+ 7}{M n} + 5 \overset{- 1}{C l} \to \overset{+ 2}{M n} + 5 \overset{0}{C l}$

⇒ $\overset{+ 7}{2 M n} + 10 \overset{- 1}{C l} \to \overset{+ 2}{2 M n} + 10 \overset{0}{C l}$

2KMnO₄ + 16HCl → 2KCl + 2MnCl₂ + 5Cl₂ + 8H₂O

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Answer 2