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Dissociation constant of formic acid is ...

Dissociation constant of formic acid is `4 xx 10^(-4)`. It is desired to prepare two liters buffer solution of pH value 4.4, using HCOOH and HCOOK. What is the concentration ratio of components to be maintained ?

Text Solution

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Dissociation constant of `HCOOH, K_a = 4 xx 10^(-4)`
`pK_a =- log k_a = 4- log =4- log 4 - 4 - 0.6 = 3.4 `
Henderson.s equation `pH = pK_a + log ([ HCOOK])/([HCOOH])`
` log ""([HCOOK])/([ pHCOOH]) =pH -pK_a = 4.4 -3.4 =1`
the ration of concentration to be maintained ,`([HCOOK])/([HCOOH])=10`
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