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Write the reactions for: preparation of...

Write the reactions for:
preparation of `H_(2)O_(2)` from two sodium salts and

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`Na_(2)O_(2) + 2NaH_(2)PO_(4)" "rarr" " 2Na_(2)HPO_(4) + H_(2)O_(2)`
`" ""Sodium dihydrogen phosphate"" ""Disodium hydrogen phosphate"`
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