cân bằng

Y

yuper

[TEX]K_2Cr_2O_7 + 6FeSO_4 + 7H_2SO_4 \Large\longrightarrow Cr_2(SO_4)_3+ 3Fe_2(SO_4)_3+ K_2SO_4 + 7H_2O[/TEX]

[TEX]2Cr^{+6} + 6e \Large\longrightarrow 2Cr^{+3}[/TEX]........................x1

[TEX]2Fe^{+2} \Large\longrightarrow 2Fe^{+3} + 2e[/TEX].........................x3
 
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