pH analysis

Chemistry Level 3

We have a 1 L 1 \text{ L} solution containing 0.05 M 0.05 \text{ M} of HF \text{HF} and 0.2 M 0.2 \text{ M} of CH 3 COOH \text{CH}_3 \text{COOH} . If the pH \text{pH} of the solution is denoted by P P , then what is the value of ⌊ 100 P ⌋ \lfloor 100P \rfloor ?

pK a \text{pK}_a of CH 3 COOH \text{CH}_3 \text{COOH} is 4.75 4.75 , and pK a \text{pK}_a of HF \text{HF} is 3.2 3.2

No approximations please, also please use wolfram alpha for calculations that can't be done with pen and paper.


The answer is 224.

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Ronak Agarwal by Ronak Agarwal , 23, India

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1 solution

Spandan Senapati
Feb 28, 2017

Simple application of Common Ion effect.No approximations can be made the eq are x ( y + x ) / ( 0.05 − x ) x(y+x)/(0.05-x) = K ( H F ) K(HF) and y ( y + x ) / ( 0.2 − y ) = K ( A c e t i c a c i d ) y(y+x)/(0.2-y)=K(Acetic acid) .Now H + H+ concentration is x + y x+y .So p H = − l o g ( x + y ) . = 2.2479 pH=-log(x+y).=2.2479

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