A buffer solution is prepared by mixing 0.1 M ammonia and 1.0 M ammonium chloride. At 298 k , the pkb of NH4OH is 5.0 . The PH of the buffer is

Question

A buffer solution is prepared by mixing 0.1 M ammonia and 1.0 M ammonium chloride. At 298 k , the pkb of NH4OH is 5.0 . The PH of the buffer is (A)  10.0  (B)  9.0  (C)  6.0  (D)  8.0

Tardigrade Admin · Accepted Answer

From Henderson equation pOH=pKb+log ( text[Salt]/ text[Base]) pH + pOH = 14 pOH =5.0+log ([1.0]/[0.1])=5+log 10=5+1 pOH =6 pH+ pOH=14 pH + 6 = 14 pH = 14 â 6 = 8

Q. A buffer solution is prepared by mixing $0.1 M$ ammonia and $1.0 M$ ammonium chloride. At $298 k$ , the $p k_{b}$ of $N H_{4} O H$ is $5.0$ . The $P H$ of the buffer is

$10.0$

$9.0$

$6.0$

$8.0$

From Henderson equation
$pO H = p K_{b} + l o g \frac{[Salt]}{[Base]}$
$p H + pO H = 14$
$pO H = 5.0 + l o g \frac{[ 1.0 ]}{[ 0.1 ]} = 5 + l o g 10 = 5 + 1$
$pO H = 6$
$p H + pO H = 14$
$p H + 6 = 14$
$p H = 14 - 6$
$= 8$

Q. A buffer solution is prepared by mixing 0.1M ammonia and 1.0M ammonium chloride. At 298k , the pkb​ of NH4​OH is 5.0 . The PH of the buffer is

10.0

9.0

6.0

8.0