1. Tardigrade
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  3. Chemistry
  4. A 100 mL 0.1 (M) solution of ammonium acetate is diluted by adding 100 ml of water. The pH of the resulting solution will be( pKa of acetic acid is nearly equal to pKb of NH4 OH)

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Q. A $100\, mL\, 0.1\, (M)$ solution of ammonium acetate is diluted by adding $100\, ml$ of water. The pH of the resulting solution will be( $pK_{a}$ of acetic acid is nearly equal to $pK_{b}$ of $NH_{4} OH$)

WBJEEWBJEE 2012Equilibrium

Solution:

Ammonium acetate is a salt of weak acid and weak base. When solutions of such salts diluted resulting $pH$ of solution is calculated from following relationship
$pH =7+\frac{1}{2} p K_{a}-\frac{1}{2} p K_{b}$
$\because p K_{a} \simeq p K_{b}$ (given)
$\therefore pH$ of diluted solution $=7$