Calculate the ratio of ch3nh2 to ch3nh3cl required to create a buffer with ph = 10.24.

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Calculate the ratio of ch3nh2 to ch3nh3cl required to create a buffer with ph = 10.24.



0.4167 = CH₃NH₂ / CH₃NH₃Cl


The CH₃NH₂ / CH₃NH₃Cl buffer has a pka of 10.62. Using Henderson-Hasselbalch formula:

pH = pka + log₁₀ [A⁻] / [HA]

Where A⁻ is weak base, CH₃NH₂, and HA is conjugate acid, CH₃NH₃Cl. It is possible to obtain the ratio of CH₃NH₂ / CH₃NH₃Cl to create a buffer with pH = 10.24, thus:

10.24 = 10.62 + log₁₀ [A⁻] / [HA]

-0.38 = log₁₀ [A⁻] / [HA]

0.4167 = [A⁻] / [HA]

0.4167 = CH₃NH₂ / CH₃NH₃Cl

I hope it helps!

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