The pH value of 1 × 10-8 (M) HCl is: 1. 8.00 2. 6.98 3. 7.01 4. 6.00
By BYJU'S Exam Prep
Updated on: September 11th, 2023
The pH value of 1 × 10-8 (M) HCl is 6.98. The degree of acidity or alkalinity measures the hydrogen ion concentration in a solution known as pH.
pH value of 1 × 10-8 (M) HCl
- HCl is a strong acid. All acids have a pH in the acid range, that is to say, below 7.
- The concentration of HCl = 10−8 M
- Total [H+] = [H+] obtained from HCL + [H+] obtained from H2O
- HCl being a strong acid, it completely ionises.
- [H+] HCl = 1.0 x 10-8.
The concentration of H+ from ionization is equal to the [OH–] from water, and let us consider it is equal to x.
[H+] H2O = [OH–] H2O = x
Total [H+] = x + 1.0 x 10-8………………………(1)
But we know
[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 x we get
x = 9.5 x 10-8
Substituting x value in equation (1)
Total [H+] = 9.5 x 10-8 + 1.0 x 10-8
Total [H+] = 1.05 x 10-7.
Consider an equation
pH = – log [H+]
pH = – log [1.05 x 10-7]
pH = 6.98
Summary:-
The pH value of 1 × 10-8 (M) HCl is: 1. 8.00 2. 6.98 3. 7.01 4. 6.00
For 1 × 10-8 (M) HCl the pH value is 6.98. The measure of alkalinity or acidity of a solution is the pH.
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