Uzgodnij równania reakcji metodą bilansu: a) → b) → c) → d) →.... Question from @Bella2385

December 2018 1 24 Report

Uzgodnij równania reakcji metodą bilansu:
a) $NaNO_{2} + FeSO_{4} + H_{2}SO_{4}$ → $Fe_{2}(SO_{4})_{3}+NO+H_{2}O+Na_{2}SO_{4}$
b) $S^{2-} +MnO_{4}+H^{+}$ → $S+Mn^{2+}+H_{2}O$
c) $MnO_{4}^{-}+H_{2}O_{2}+H^{+}$ → $MnO_{4}^{-}+Bi^{3+}+H_{2}O$
d) $Cr_{2}O_{7}^{2-}+CH_{3}-CH_{2}-OH+H^{+}$ → $Cr^{3+}+CH_{3}-CHO+H_{2}O$

Daneel A.
$NaNO_{2} + 2FeSO_{4} + H_{2}SO_{4}\rightarrow Fe_{2}(SO_{4})_{3}+NO+H_{2}O+Na_{2}SO_{4}$

N(+III) + e → N(+II) | 2
2Fe(+II) - 2e → 2Fe(+III) | 1

$2NaNO_{2} + 2FeSO_{4} + 2H_{2}SO_{4}\rightarrow \\ \rightarrow Fe_{2}(SO_{4})_{3}+2NO+2H_{2}O+Na_{2}SO_{4}$

b.
$S^{2-} +MnO_{4}^-+H^{+}\rightarrow S+Mn^{2+}+H_{2}O$

S(-II) - 2e → S(0) | 5
Mn(+VII) + 5e → Mn(+II) | 2

$5S^{2-} +2MnO_{4}^-+16H^{+}\rightarrow 5S+2Mn^{2+}+8H_{2}O$

c. coś tu jest nie tak… powinno być:
$MnO_{4}^{-}+H_{2}O_{2}+H^+ \rightarrow Mn^{2+} + O_2 + H_2O$

Mn(+VII) + 5e → Mn(+II) | 2
2O(-I) -2e → O2 (0) | 5

$2MnO_{4}^{-}+5H_{2}O_{2}+6H^+ \rightarrow 2Mn^{2+} + 5O_2 + 8H_2O$

d.
$Cr_{2}O_{7}^{2-}+C_2H_5OH+H^{+}\rightarrow 2Cr^{3+}+CH_{3}CHO+H_{2}O$

2Cr(+VI) +6e → 2Cr(+III) | 2 | 1
C(-I) - 2e → C(+I) | 6 | 3

$Cr_{2}O_{7}^{2-}+3C_2H_5OH+8H^{+}\rightarrow 2Cr^{3+}+3CH_{3}CHO+7H_{2}O$

proszę :)