The hydronium ion concentration of the solution with given value of pOH is 7.94 × 10⁻⁸M.
Option D) is the correct answer.
The pH of a solution is defined as the logarithm of the reciprocal of the hydrogen ion concentration [H+] of the given solution.
From the formular;
pH = -log[ H⁺ ]
pH + pOH = 14
Given that;
First we find the pH
pH + pOH = 14
pH + 6.90 = 14
pH = 14 - 6.90
pH = 7.1
Now, from the above expression;
pH = -log[ H⁺ ]
Hence;
[ H⁺] = 10^(-pH)
[ H⁺] = 10^(-7.1)
[ H⁺] = 7.94 × 10⁻⁸M
Therefore, the hydronium ion concentration of the solution with given value of pOH is 7.94 × 10⁻⁸M.
Option D) is the correct answer.
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