Rajasthan BoardEnglish MediumSTD 12 ScienceChemistryElectrochemistry2 Marks
Question
Explain electrolysis of sulphuric acid.
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Answer
$\rightarrow $ In the electrolysis of dilute Sulphuric acid only electrolysis of water occurs.
$\ce{2 H _2 O ( l ) \rightarrow O _2(g)+4 H ^{+}( aq )+4 e ^{-}} E _{\text {(cell) }}^{\ominus}=$
$+1.23 V$
$\rightarrow$ Electrolysis of concentrated sulphuric acid oxidise $\ce{SO _4^{-2}}$ ion $\ce{S _2 O _8^{-2}}$
$\ce{2 SO _4^{2-}( aq ) \rightarrow S _2 O _8^{2-}( aq )+2 e ^{-} } E _{(\text {cell })}^{\ominus}=1.96 V$
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