What is the pH of a buffer solution that contains 0.55 M methylamine, CH 3NH2, and 0.29 M methylammonium chloride, CH3NH3Cl?A

pH = 10.93

Explanation:

To find the pH we need to use the Henderson - Hasselbalch equation:

Where:

[A⁻]: is the conjugate base of the acid = [CH₃NH₂] = 0.55 M

[HA]: is the acid = [CH₃NH₃Cl] = 0.29 M

Since the pkb of methylamine is 3.35, the pka is:

Now, the pH is:

Therefore, the pH of the buffer solution is 10.93.

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