A sample of water was alkaline both to phenolphthalein and methyl orange. 100 mL of this water sample required 20 mL of N/50 HCl for phenolphthalein end point and another 15 mL for complete neutralization. Elucidate the type and strength of alkalinity present in the water sample
Here,diacidic base is present which gives two end points one with phenolphthalein and another with methyl orange.
Now, for phenolphthalein end point
equivalent to diacidic base equivalent of 15mL
or equivalent of diacidic base=
or, 1M equivalent of diacidic base=
But,
For Methyl Orange end point
1M equivalent of monoacidic base formed=1M equivalent of 15mL
or 1M equivalent of monoacidic base formed
Thus ,normality of diacidic alkalinity present in 100mL sample of water is given by :-
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