1.

A 2.5 gm impure sample containing weak monoacidic base (Mol. wt. = 45) is dissolved in 100 ml water and titrated with 0.5 M HCI when of ((1)/(5))^(th) the base was neutralised the pH was found to be 9 and at equivalent point pH of solution is 4.5. Given: All data at 25^(@)C & log 2 = 0.3. Select correct statement( s).

Answer»

`K_(b)` of base is less than `10^(-6)`
CONCENTRATION of salt (C) at equivalent point is 0.25 M
VOLUME of HCl is USED at equivalent point is 100 ml
Weight percentage of base in GIVEN sample is 80%.

ANSWER :bc


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