Answer :
The buffer's pH value is 10.10.
Why is pH so crucial?
The crucial parameter of pH represents the chemistry of a solution. The pH can affect how readily available nutrients are, how biological processes work, how bacteria behave, and how chemicals behave.
Trimethylamine is a weak base that creates a buffer when present with its conjugate base, trimethylammonium ion.
We use the H-H equation for weak bases to get the pH of the buffer:
pOH = pKb + log [Conjugate acid] / [Weak base]
pKb is -log Kb = 4.20
pOH = 4.20 + log [N(CH₃)₃] / [NH(CH₃)₃]
Replacing the concentrations of the problem:
pOH = 4.20 + log [0.075M] / [0.12M]
pOH = 3.9
As pH = 14 -pOH
The buffer's pH value is 10.10.
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