Question

Calculate molar concentration of formic acid solution if degree of dissociation is 4% K(HCOOH)=2.10^_4

Answer 1

Answer: The molar concentration of formic acid solution is 0.12 M

Step-by-step explanation:

`HCOOH\rightarrow HCOO^-+H^+`

cM 0 0

`c-c\alpha`
`c\alpha`
`c\alpha`

So dissociation constant will be:

`K_a=((c\alpha)^(2))/(c-c\alpha)`

Give c= ? and
`\alpha` =
`(4)/(100)=0.04`

`2* 10^(-4)=((c* 0.04)^2)/((c-c* 0.04))`

On solving for c we get:

`c=0.12M`

Thus molar concentration of formic acid solution is 0.12 M