---
tags:
 - ech
---
# Příklady

## Redoxní
$$Br_2 + KOH \rightarrow KBr + KBrO_3 + H_2O$$
$$3Br_2^0 + 6KOH \rightarrow \textcolor{yellow}{5}KBr^{-I} + \textcolor{yellow}{1}KBr^{+V}O_3 + 3H_2O$$
Redukce $Br^0 + 1e^- \rightarrow Br^{-I}$ 1  ==5==
Oxidace $Br^0 - 5e^- \rightarrow Br^V$   5  ==1==

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$$FeSO_4 + K_2Cr_2O_7 + H_2SO_4 \rightarrow Fe_2(SO_4)_3 + Cr_2SO_4 + H_2O$$
$$6Fe^{II}SO_4 + 1K_2Cr_2^{II}O_7 + 7H_2SO_4 \rightarrow \textcolor{yellow}3Fe_2^{III}(SO_4)_3 + \textcolor{yellow}1Cr_2^{III}SO_4 + 7H_2O$$
Ox: $2Fe^{II} - 2e^- \rightarrow Fe_2^{III}$ 2 ==3==
Red: $Cr_2^{VI} + 6e^- \rightarrow Cr_2^{III}$ 6 ==1==

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$$Cr_2O_r + KNO_3 + K_2CO_3 \rightarrow K_2CrO_4 + CO_2 + KNO_3$$
$$\textcolor{yellow}1Cr_2^{III}O_3 + \textcolor{yellow}3KN^{V}O_3 + 2K_2CO_3 \rightarrow 2K_2Cr^{VI}O_4 + 2CO_2 + 3KN^{III}O_3$$
Red: $N^V + 2e^- \rightarrow N^{III}$ 2 ==3==
Ox: $Cr^{III} - 6e^- \rightarrow Cr^{VI}$ 6 ==1==

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$$HI + H_2SO_4 \rightarrow I_2 + S + H_2O$$
$$\textcolor{yellow}6HI^{-I} + 1H_2^{I}S^{VI}O_4^{-II} \rightarrow 3I_2^{0} + \textcolor{yellow}1S^0 + 4H_2O$$
Ox: $I^{-I} - 1e^- \rightarrow I^{0}$ 1 ==6==
Red: $S^{VI} + 6e^- \rightarrow S^0$ 6 ==1==