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a 0.252g sample pf inknown organic base is dissolved in water n titrated with a 0.14M HCl sol. aftr d addition f 20 ml acid,a pH of 10.7 is recorded. the equivalence pt. is reached at 40 ml HCl. acid n base combine in 1:1.find kb of base??

9 years ago

Answers : (1)

879 Points

Dear student,

Ka = [H+] * [A-] / [HA]

Rearrange to give [H+(aq)]:

[H+] = Ka * ([HA] / [A-])

Take log10 of both sides:

log[H+] = log(Ka) + log([HA] / [A-])

Multiply both sides by -1:

-log[H+] = -log(Ka) - log([HA] / [A-])

Recognizing that -log[H+] is pH, and -log(Ka) is pKa

pH = pKa - log([HA] / [A-])


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Askiitians Expert

Sagar Singh

B.Tech, IIT Delhi

9 years ago
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