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3 years ago

Calculate the ratio of ch3nh2 to ch3nh3cl required to create a buffer with ph = 10.22.

1 answer:

6 0

When the Ka value for CH3NH2 = 2.27 x 10 ^-11

and when we have the Ka value so, we can get Pka from this formula:

Pka = -㏒Ka

∴Pka = -㏒ (2.27 x10^-11)
= 10.6

now, to get the base/acid ratio by using Henderson-Hasselblach equation:

PH = Pka + ㏒[base/acid]

so by substitution:

10.22 = 10.6 + ㏒[base/acid]

∴[base/acid] = 0.417

∴[CH3NH2/CH3NH3Cl] = 0.417

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