Question

Calculate pH of a 1.0×10 power -8 M solution of HCl.

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Answer 1

Given,

Concentration of HCl = 1.0 × 10⁻⁸

As HCl is a strong acid, it dissociates as,

   HCl     →        H⁺     +     Cl⁻

1.0 × 10⁻⁸    1.0 × 10⁻⁸    1.0 × 10⁻⁸

Formula of pH is-

pH = -log[H⁺]

Thus,

pH of HCl solution = -log[1.0 × 10⁻⁸]

                               = -(-8)

                               = 8