Question
Asked Oct 17, 2019
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Calculate the pH at 25°C of a 0.64M solution of anilinium chloride C6H5NH3Cl. Note that aniline C6H5NH2 is a weak base with a pKb of 4.87.

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Step 1

The pKb of C6H5NH2 is 4.87. The pKa of C6H5NH3+ is calculated using equation (1).

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Step 2

The acid ionization constant of C6H5NH3+ (Ka) is calculated using equation (2).

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рк, —- 1og (K,) .. (2) a К, —10 РК, 109.13 = 7.413 x 10-10

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Step 3

The aqueous solution of C6H5NH3Cl contains C6H5NH3+ and Cl-. The acid ionization constant of C6H5NH3+ is very low. The C6H5NH3+ ionizes very weakl...

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CCHNH H =CH,NH2+H,0* (3)

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