50 mL 0.2 M ammonia solution is treated with 25 mL of 0.2 M HCl. If pK b of ammonia solution is 4.75, the pH of the mixture will be

Question

50 mL 0.2 M ammonia solution is treated with 25 mL of 0.2 M HCl. If pK b of ammonia solution is 4.75, the pH of the mixture will be (A)  (B)  (C)  (D)

Tardigrade Admin · Accepted Answer

In the given reaction, all the HCl will be neutralized and NH 4 Cl will be formed and equivalent amount of NH 4 OH will remain in the solution. Thus, the final solution will contain NH 4 OH and NH 4 Cl, which can act as basic buffer solution. The concentration of NH 4 Cl and NH 4 OH will be same. pOH = pK b + log 10 ([ text Salt ]/[ text Base ]) pOH =4.75+ log 10 (1/1) pOH =4.75 pH =14- pOH =14-4.75=9.25

Q. 50mL0.2M ammonia solution is treated with 25mL of 0.2MHCl. If pKb​ of ammonia solution is 4.75, the pH of the mixture will be______

Q. $50 m L 0.2 M$ ammonia solution is treated with $25 m L$ of $0.2 M H Cl$ . If $p K_{b}$ of ammonia solution is $4.75$ , the $p H$ of the mixture will be______