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JEE Main 2008

Exam: JEE Main
Year: 2008
Subject: Chemistry
Chapter: Ionic Equilibrium

JEE Main 2008 · Chemistry · Ionic Equilibrium

The pK_ a of a weak acid, HA , is 4.80 . The pK_ b of a weak base,...

The

\mathrm{pK}_{\mathrm{a}}

of a weak acid,

\mathrm{HA}

, is

4.80

. The

\mathrm{pK}_{\mathrm{b}}

of a weak base,

\mathrm{BOH}

, is

4.78

. The

\mathrm{pH}

of an aqueous solution of the corresponding salt, BA, will be

Options

A $9.58$
B $4.79$
C $7.01$
D $9.22$

Correct answer

C. $7.01$

Step-by-step solution

It is a salt of weak acid and weak base

\begin{aligned}& {\left[\mathrm{H}^{+}\right]=\sqrt{\frac{\mathrm{K}_{\mathrm{w}} \times \mathrm{K}_{\mathrm{a}}}{\mathrm{K}_{\mathrm{b}}}}} \\ & \mathrm{pH}=7.01 \end{aligned}

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