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# Reaction between ethanol, sulfuric acid and potassium permanganate

## Experiment 1

Click the image !

## Experiment 2

Click the image !

## Partial redox systems

Ethanol $\Rightarrow$ ethanal: $CH_3CH_2OH$ $-$ $2e^-$ $\rightarrow$ $CH_3CHO$ $+$ $2H^+$ Ethanal $\Rightarrow$ ethanoic (acetic) acid: $CH_3CHO$ $-$ $2e^-$ $+$ $H_2O$ $\rightarrow$ $CH_3COOH$ $+$ $2H^+$

## Redox reactions

- First step: Ethanol $\Rightarrow$ ethanal: $CH_3CH_2OH$ $-$ $2e^-$ $\rightarrow$ $CH_3CHO$ $+$ $2H^+$ | $\cdot 5$ $MnO_4^-$ $+$ $5e^-$ $+$ $8H^+$ $\rightarrow$ $Mn^{2+}$ $+$ $4H_2O$ | $\cdot 2$ $5CH_3CH_2OH$ $+$ $2MnO_4^-$ $+$ $6H^+$ $\rightarrow$ $5CH_3CHO$ $+$ $2Mn^{2+}$ $+$ $8H_2O$

- Second step: ethanal $\Rightarrow$ ethanoic (acetic) acid: $CH_3CHO$ $-$ $2e^-$ $+$ $H_2O$ $\rightarrow$ $CH_3COOH$ $+$ $2H^+$ | $\cdot 5$ $MnO_4^-$ $+$ $5e^-$ $+$ $8H^+$ $\rightarrow$ $Mn^{2+}$ $+$ $4H_2O$ | $\cdot 2$ $5CH_3CHO$ $+$ $2MnO_4^-$ $+$ $6H^+$ $\rightarrow$ $5CH_3COOH$ $+$ $2Mn^{2+}$ $+$ $3H_2O$

A color change from purple $(MnO_4^-)$ to palepink $(Mn^{2+})$ is observed !