1.

52 mLof a solution , containing 1 g each of Na_(2)CO_(3) ,NaHCO_(3) and NaOHwas titrated with N HCl . What will be the titre readings if methyl orange is addedafter the first end point with phenolphthalein ?

Answer»

Solution :The reactions in this case are ,
`NaHCO_(3) (" PRODUCED ") +HCl to NaCl +H_(2)O +CO_(2)`
and `NaHCO_(3) +m.e of v_(3)` mL (SAY) of N HCl
`1/106 xx 1000 +1/84 xx1000 = 1xx v_(3)`
` :. "" v_(3) = 21/3 mL `


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