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5.1 g sample of H2O2 solution containg x...

5.1 g sample of `H_2O_2` solution containg `x%H_2O_2` by weight requires x mL of `K_2Cr_2O_7` solution for complete oxidation under acidic condition. What is the molarity of `K_2Cr_2O_7` solution?

Text Solution

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`100 g of H_(2)O_(2)` solution contains =`xg of H_(2)O_(2)`
`5.1 g of H_(2)O_(2)` solution contains =`(x xx5.1)/100 g` of `H_(2)O_(2)`
=Weight of `H_(2)O_(2)`
`mEq` of `H_(2)O_(2)=("Weight of " H_(2)O_(2)xx10^(3))/(EW(H_(2)O_(2))`
`=(5.1x)/100xx10^(3)xx1/17=3x mEq`
`:'Cr_(2)O_(7)^(2-)-=H_(2)O_(2)`
`mEq-=mEq`
`N_(1)V_(1)=3x`
`N_(1)xx x=3x`
`N(K_(2)Cr_(2)O_(7))=3N`
`M(K_(2)Cr_(2)O_(7))=N/n=3/6=0.5 M`
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