One litre solution of alkali ( NaOH ) is prepared by dissolving impure solid of alkali which contian 5% `Na_(2) CO_(3)` and 8% `CaCO_(3)` and `10%` NaCl. A 10ml portion of this solution required 9.8 ml of a 0.5 M `H_(2)SO_(4)` solution for neutralization. Calculate weight of alkali dissolved initially gm eq. of `Na_(2) CO_(3) +` gm eq. of `CaCO_(3) +` gm eq. of NaOH `=` gm of `H_(2) SO_(4)`

Explanation

`(5x)/( 100) xx ( 1)/( 53) + ( 8 x)/( 100) xx ( 1)/( 50) + (77x)/( 100) xx( 1)/( 40) = 0.98`
`x = 45 g `