Question

Equal volumes of 0.1 M NH3 (Kb= 1.8x10^-5) and 0.1 M HCN (Ka= 4.9x10^-10) are mixed...

Equal volumes of 0.1 M NH3 (Kb= 1.8x10^-5) and 0.1 M HCN (Ka= 4.9x10^-10) are mixed together. will the resulting solution be acidic, basic, or neutral? PLEASE SHOW WORK

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Homework Answers

Answer #1

NH4CN is the salt made up of weak acid(HCN) and weak base(NH3)

NH3 + HCN -- NH4CN

Salts of this kind can be neutral, acidic, or basic depending upon the

strength of the acid and base

strength of the acid and base

Expression for calculating the pH of salts of weak acids and weak bases

Expression for calculating the pH of salts of weak acids and weak bases

is as follows: pH = 7 + 1/2 — (pKa —pKb)

Ka of acid (HCN) = Kw/Kb = 49x10-10

pKa of acid = -log Ka

= -log (4.9 x 10-10)

= 9.31

Kb of base (NH3) -

pkb of base (NH3) -

- 10-5)

pH = 7+ 1/2

= 9.285

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