Pyridinium is a weak acid having a pKa of 5.2. How much pyridine (the conjugate base of pyridinium) must be added to an aqueous solution of 0.100M pyridinium (assume the solution volume is constant) to make a buffer that is designed to keep the pH at 4.7?
1 answer:
Answer:
Amount of pyridine required = 0.0316 M
Explanation:
pH of a buffer solution is calculated by using Henderson - Hasselbalch equation.
Pyridinium is a weak acid and in the presence of its conjugate base, it acts as buffer.
Henderson - Hasselbalch equation for pyridine/pyridinium buffer is as follows:
pH = 4.7
(Pyridinium)=0.100 M
Substitute the values in the formula
[Py]=0.0316\ M
Amount of pyridine required = 0.0316 M
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