A buffered solution containing dissolved aniline, C 6 H 5 NH 2, and aniline hydrochloride, C 6 H 5 NH 3 Cl, has a pH of 5.47. A. Determine the concentration of C 6 H 5 NH + 3 in the solution if the concentration of C 6 H 5 NH 2 is 0.215 M. The p K b of aniline is 9.13.

Question

Dane Wells

Chemistry

25 February, 20:09

A buffered solution containing dissolved aniline, C 6 H 5 NH 2, and aniline hydrochloride, C 6 H 5 NH 3 Cl, has a pH of 5.47. A. Determine the concentration of C 6 H 5 NH + 3 in the solution if the concentration of C 6 H 5 NH 2 is 0.215 M. The p K b of aniline is 9.13.

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Sugar · Answer 1

Answer: the concentration of C6H5 NH3 + = 0.031M

Explanation:

From question pH = 5.47

pH+pOH = 14

pOH = 14-5.47 = 8.53

Using the Henderson Hasselbalch equation

pOH = pKb + log (salt/base)

8.53 = 9.13 + log (salt/0.125)

8.53-9.13 = log (salt/0.125)

-0.6 = log (salt/0.125)

Antilog (-0.6) = salt/0.125

0.251 = salt/0.125

Salt conc. = 0.125*0.251=0.031M