The pH of 10⁻⁸ M HCl solution is

Step-by-step solution

As HCl solution is acidic in nature and the pH of an acidic solution cannot exceed more than 7 . Thus, the answer must be 6.9586 . We can also find this answer through calculations. From acid, [ H ⁺ ]=10⁻⁸ M But the [ H ⁺ ] ions from water, i.e., [ H ⁺ ]=10⁻⁷ M cannot be neglected in comparison to 10⁻⁸ M . The pH can be calculated as follows From acid, [ H ⁺ ]=10⁻⁸ M From water, [ H ⁺ ]=10⁻⁷ M aligned Total [ H ⁺ ] &=10⁻⁸+10⁻⁷=10⁻⁸(1+10) &=11 10⁻⁸ M pH &=- [ H ⁺ ] &=- (11 10⁻⁸ ) &=- [ 11+ 10⁻⁸ ] &=-[1.0414-8]=6.958