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compute the ph of 10^-33 M HCL

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11th

Chemistry

Equilibrium

pH Scale

Calculate the pH of 10-8 M ...

CHEMISTRY

Calculate the pH of 10−8 M HCl.

A .

8

B .

6

C .

7

D .

6.98

December 26, 2019Afroze Kasyap

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ANSWER

On using this relation, pH= –log[H3O+], we get pH equal to 8. But this is not correct because an acidic solution cannot have pH greater than 7.

 It may be noted that in very dilute acidic solution when H+ concentrations from acid and water are comparable, the concentration of H+ from water cannot be neglected.

Therefore,

[H+] total = [H+] acid + [H+] water

Since HCl is a strong acid and is completely ionized.

[H+]HCl=1.0×10−8

The concentration of H+ from ionization is equal to the [OH–] from water,

[H+]H2O=[OH–]H2O = x (say)

[H+] total =1.0×10−8+x

But,

[H+][OH–]=1.0×10−14

(1.0×10−8+x)(x)=1.0

Explanation:

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