Answer: The pH of the solution will decrease by 1 unit.
Explanation:
Let say the hydronium ion concentration of a solution is 0.001
pH = - log [H+]
= -log 1.0 x 10^3 = 3
if the hydronium ion concentration is increased by 10 , that is: 0.001 x 10 = 0.01
pH = -log [1.0 x 10^2]
= 2
Therefore, the pH is reduced by 1 unit when the hydronium ion concentration is increased by a factor of 10.
If the hydronium ion concentration of a solution is increased by a factor of 10, it means solution gets more acidic as the value of pH is reduced.
pH of any solution will define as the negative logarithm of the concentration of hydronium ion and it is represented as:
pH = -log[H⁺]
Let we assume that the concentration of H⁺ ion is 1 and value of its pH is-
pH = -log(1) = 0
Now if the concentration of H⁺ ion is increased by a factor of 10 then value of pH-
pH = -log(10) = -1
Hence, pH of the solution decreases.
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