What is the hydrogen ion concentration of a solution with a ph = 8.25?

The concentration of H⁺ Ions can be calculated using following formula,

                                        pH  =  -log [H⁺]
or,
                                       -pH  =  log [H⁺]
Now, Solving for [H⁺],
                                        [H⁺]  =  10⁻⁽pH⁾
Putting value of pH,
                                        [H⁺]  =  10⁻⁽⁸·²⁵⁾

                                        [H⁺]  =  5.62 × 10⁻⁹ M

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