A buffered solution containing dissolved aniline, C6H5NH2, and aniline hydrochlo

Question

A buffered solution containing dissolved aniline, C6H5NH2, and aniline hydrochloride, C6H5NH3Cl, has a pH of 5.58.

a) Determine the concentration of C6H5NH3 in the solution if the concentration of C6H5NH2 is 0.260 M. The pKb of aniline is 9.13.

b)A buffered solution containing dissolved aniline, C6H5NH2, and aniline hydrochloride, C6H5NH3Cl, has a pH of 5.58. a) Determine the concentration of C6H5NH3 in the solution if the concentration of C6H5NH2 is 0.260 M. The pKb of aniline is 9.13.

**Please do not copy and paste from previous responses, not always right**

Explanation / Answer

A buffered solution containing dissolved aniline, C6H5NH2, and aniline hydrochloride, C6H5NH3Cl, has a pH of 5.58.

a) Determine the concentration of C6H5NH3 in the solution if the concentration of C6H5NH2 is 0.260 M. The pKb of aniline is 9.13.

Apply buffer equation

pOH = pKb + log(C6H5NH3+ / C6H5NH2)

pOH = 14-pH = 14-5.58 = 8.42

8.42 = 9.13 + log(C6H5NH3+ / 0.260 )

[C6H5NH3+] = 0.260 *10^(8.42 -9.13 ) = 0.05069 M

[C6H5NH3+] = 0.05069 M

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