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 ?

Dissociation constant of formic acid is 4 xx 10^(-4). It is desired to

1.	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 ?
Answer» SOLUTION :Dissociationconstantof `HCOOH, K_a = 4 XX 10^(-4)` `pK_a=- logk_a= 4- log =4- log4 - 4 - 0.6= 3.4 ` Henderson.sequation`pH = pK_a+ log([ HCOOK])/([HCOOH])` ` log ""([HCOOK])/([ pHCOOH]) =pH-pK_a = 4.4 -3.4=1` the rationof concentrationto bemaintained,`([HCOOK])/([HCOOH])=10`