Answer to Question #210061 in General Chemistry for mmm

Question #210061

A weak organic acid has a Ka value of 1.2x10-6 at 25 °C.

(a) A buffer is prepared by mixing 500 mL 0.10 M of this weak acid solution with 250 mL of 0.04 M NaOH solution, which was further diluted to a volume of 1.25 L. Calculate the pH of the buffer solution.

(b) What will be the pH of this buffer solution after further addition of 250 mL of 0.02 M NaOH solution?


1
Expert's answer
2021-06-25T05:41:11-0400

"k_a=1.2\\times 10^{-6}"


(a) V=500ml, M=0.1M ,


"P_h=-log[H^{+}]=-log(2\\times 10^{-13})=13-0.301=12.7"


(b) V=250ml, M=0.02


"P_h=P_{H_a}+log\\dfrac{250}{500}=12.7+0.301=13"


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