1.

The amountphosphoric acid, (H_(3)PO_(4)) required to prepare 550 mL of 0.40 N solution (i) assuming complete neutralization (ii) assumingreduction to HPO_(3)^(2-)are respectively :

Answer»

`7.19g , 10.89 g`
`10.8 g, 7.19 g`
`7.19 g, 7.19 g`
`10.8 g , 10.8 g`

SOLUTION :(i) `H_(3)PO_(4) + 3NaOH to Na_(3)PO_(4) + 3H_(2)O , . E = M/3`
Meq . of `H_(3)PO_(4) = 550 xx 0.4`
`W/(98//3) xx 1000= 550 xx 0.4 rArrW = 7.19 ` g
(ii) ` P^(5+) + 2e to P^(3+) "" (. :. E = M/2) `
Meqof `H_(3)PO_(4) = 550xx 0.4`
` W/(98//2) xx 1000= 550xx 0.4 rArrW = 10.8 g`


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