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Chemical Reactions

Acids and Bases

What is the pH of an aqueous solution?

The pH of an aqueous solution provides a description of the concentration of H3O+ ions (or water molecules that have accepted an extra proton) in the solution. The pH is calculated as the negative logarithm (base 10) of the activity of H3O+ ions in solution. A pH near 7 indicates that the solution is nearly neutral, in the sense that this would be the pH of pure water without any acid or base added. A pH value lower than 7 indicates that the solution is at least somewhat acidic, while a pH above 7 indicates the solution is basic.

The equation describing the pH of a solution is:



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