1.

What is the pH of 1 M CH_3COOH solution? K_a of acetic acid is 1.8 times 10^-5. K=10^-14 mol^2 litre^2.

Answer»

9.4
4.8
3.6
2.4

Solution :`CH_3COO^(-) +H_2O leftrightarrowCH_3COOH+OH^-`
`[OH^-]=C times H`
`h=SQRT((K_w)/K_a TIMESC)=sqrt(10^-14/(1.8 times10^-5) times1)`
`=2.35 times10^-5`
`pOH=4.62`
`thereforepH+pOH=14`
`pH=14-4.62=9.38`


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