The required pH of the solution is 4.2 which means solution is acidic in nature.
pH of the solution is define as the negative logarithm of the concentration of the hydronium ion, and it is represented as:
pH = -log[H⁺]
Given concentration of H₃O⁺ ion = 6.25×10⁻⁵ M
On putting this value on above equation, we get
pH = -log(6.25×10⁻⁵) = 4.2
Hence required pH of the solution is 4.2.
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