A 2 5 g impure sample containing weak monoacidic base Mol wt 45 u is dissolved in 100 mL water and titrated with 0 5 M HCI When

Question

A 2 5 g impure sample containing weak monoacidic base Mol wt 45 u is dissolved in 100 mL water and titrated with 0 5 M HCI When 1 4 th of the base was neutralised the pH was found to be 9 and at equivalence point pH of solution is 4 5 Select correct statement s A K of base is less than 10 6 B Concentration of salt C at equivalent point is 0 25 M C Volume of HCI used at equivalent point is 100 mL D Weight percentage of a base in given sample is 80

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