Phosphoric acid is preferred over sulphuric acid in preparing hydrogen peroxide from peroxides. Why?
(N/A) $H_{2}SO_{4}$ acts as a catalyst for the decomposition of $H_{2}O_{2}$. Therefore,weaker acids such as $H_{3}PO_{4}$ are preferred over $H_{2}SO_{4}$ for preparing $H_{2}O_{2}$ from peroxides.
$3BaO_{2} + 2H_{3}PO_{4} \rightarrow Ba_{3}(PO_{4})_{2} + 3H_{2}O_{2}$
$3BaO_{2} + 2H_{3}PO_{4} \rightarrow Ba_{3}(PO_{4})_{2} + 3H_{2}O_{2}$
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