A 1.025 g sample containing a weak acid, HX (molecular weight=82 g mol-1) is dissolved in 60 mL water and titrated with 0.25 M NaOH. When half of the acid was neutralised, the pH was found to be 5.0. At the equivalence point, the pH was 9.0. The weight percentage (purity) of HX in the sample is (Nearest integer)

Question

1.025 g

sample containing a weak acid,

HX

(molecular weight

= 82 g {mol}^{- 1}

) is dissolved in

60 mL

water and titrated with

0.25 M NaOH

. When half of the acid was neutralised, the

pH

was found to be

5.0

. At the equivalence point, the

pH

was

9.0

. The weight percentage (purity) of

HX

in the sample is (Nearest integer)

Correct Answer

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