Science, asked by sharmariya02122003, 1 year ago

10raised power -8 is the pH of HCl find the pH value of hcl here and also advice whether it is acdic or basic in nature

Answers

Answered by KunalVerma911

Hi there

The formula for pH is -log[H+]
Here concentration of H+ ion is 10^-8
so pH=-log[10^-8]
or pH=-(-8)=8
The pH of a substance is inversely proportional to H+ concentration which means that a substance with low pH is more acidic than a substance with high pH.Also pH of a neutral substance is 7,so substances with pH<7 are acidic and substances with pH>7 are basic.Here pH=8 which is more than 7.Hence the solution is basic in nature.

Hope it helps.

sharmariya02122003: wrong hcl is acidic in nature

KunalVerma911: Oops i didn't see HCl.Here the answer was wrong because we neglected the H+ produced by Water.

KunalVerma911: [H+] total = [H+] acid + [H+] water
Since HCl is a strong acid and is completely ionized
[H+] HCl = 1.0 x 10-8
The concentration of H+ from ionization is equal to the [OH–] from water,
[H+] H2O = [OH–] H2O
= x (say)
[H+] total = 1.0 x 10-8 + x
But
[H+] [OH–] = 1.0 x 10-14
(1.0 x 10-8 + x) (x) = 1.0 x 10-14
X2 + 10-8 x – 10-14 = 0
Solving for x, we get x = 9.5 x 10-8
Therefore,
[H+] = 1.0 x 10-8 + 9.5 x 10-8
= 10.5 x 10-8
= 1.05 x 10-7
pH = – log [H+] = – log (1.05 x 10-7) = 6.98

KunalVerma911: This is correct answer

sharmariya02122003: thanks

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