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Aqueous solution of HCL is diluted by five times. What will be the change in pH?

Aqueous solution of HCL is diluted by five times. What will be the change in pH?

Grade:12

1 Answers

Sunil Kumar FP
askIITians Faculty 183 Points
9 years ago
ph is measured in terms of the activity of the H+ io.
pH=-log(H+)
on dilutimg the solution 5 times means increasing the volume from v to 5v
let the number of mole of H+ ion be x
initial pH at a volume V=-log[H+] =-log[x/v] =pH1
now on dilution new pH= -log[H+]=-log [x/5v]=pH2
change in ph =pH2 -pH1 =-log(x/5v)-(-log(x/v)) =log(x/v)-log(x/5v) =log 5 =.6989

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