General Chemistry

We have learned that the pH is calculated by the following formula:

To calculate the concentration of H+ or H3O+ hydronium ion from pH, we take the antilog of the pH, that is 10 to the negative power of pH.

For example, calculate the hydronium ion concentration in an aqueous solution with a pH of 5.64 at 25°C.

pH = -log [H3O+], [H3O+] = 10-pH = 10-5.64 = 2.29 × 10-6 M


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