1.

The pH of a blood stream is maintained by a proper balance of H_(2)CO_(3) and NaHCO_(3) .What volume of 5MNaHCO_(3) solution should be mixed with 10ml of a sample of solution which is 2.5M in H_(2)CO_(3) in order to maintain a pH=7.4(Take pK_(a_(1)) for H_(2)CO_(3)=6.7,log2=0.3)

Answer»

SOLUTION :`pH=pK_(a_(1))+log""([HCO_(3)^(-)])/([H_(2)CO_(3)])`
`rArr 7.4=6.7+log""([HCO_(3)^(-)])/([H_(2)CO_(3)]) rArr ([HCO_(3)^(-)])/([H_(2)CO_(3)])=5`
`:.5xx"moles of" H2CO3`=Moles of `HCO_(3)^(-)` (since both are components of same solution,volume of solution WOULD be same for both)
`rArr :.5xx2.5xx10xx10^(-3)=5-VrArr "required volume"=0.025L=25mL`


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