The pH of a buffer solution containing equal molal concentration of a weak base and its chloride ($K_{b}\ for\ \ weak\ base = 2 imes 10^{- 5}$) is

Question

The pH of a buffer solution containing equal molal concentration of a weak base and its chloride ($K_{b}\ for\ \ weak\ base = 2 	imes 10^{- 5}$) is

Dr. Abubacker · Accepted Answer

(d)
For basic buffer,
$pOH = pK_{b} + \log\frac{\lbrack saltbrack}{\lbrack basebrack}$
Given, [salt]=[base]=1
$K_{b} = 2 	imes 10^{- 5}$
$	herefore$ $pOH = pK_{b} = - \log{(2 	imes 10^{- 5})}$
$= 5 - \log 2$
$\  = 5 - 0.30 = 4.70$
$pH = 14 - pOH$
$= 14 - 4.70 = 9.30$

Q. The pH of a buffer solution containing equal molal concentration of a weak base and its chloride ($K_{b}\ for\ \ weak\ base = 2 \times 10^{- 5}$) is

Explanation

Reviewed by Dr. Abubacker

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