Maharashtra BoardEnglish MediumSTD 12 ScienceChemistryIonic Equilibria3 Marks
Question
What are the types of buffer solutions ?
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Answer
These are two types of buffer solutions : (A) Acidic buffer solution : it is a solution containing a weak acid e.g. $\left( CH _3 COOH \right)$ and its salt of a strong base. e.g. ( $CH _3 COONa$ ). $pH$ of an acidic buffer is given by following Henderson Hasselbalch equation, $pH = p K_{ a }+\log _{10} \frac{[\text { Salt }]}{[\text { Acid }]}$ where $pK _{ a }=-\log _{10} K _{ a }$ and $K _{ a }$ is the dissociation constant of weak acid.
(B) Basic buffer solutions : It is a solution containing a weak base (e.g. $NH _4 OH$ ) and its salt of strong acid, (e.g. $NH _4 Cl$ ). pOH of a basic buffer is given by Henderson Hassebalch equation, $pOH = p K_{ b }+\log _{10} \frac{[\text { Salt }]}{[\text { Base }]}$ where $pK _{ b }=-\log 10 K _{ b }$ and $K_b$ is the dissociation constant of a weak base.
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