Summary:
- The pH of a solution is the negative logarithm of the hydrogen-ion concentration.
- In pure water or a neutral solution the [H+] = 1.0 × 10-7 M. Solutions whose pH is less than 7 are acidic, while those with a pH higher than seven are basic.
- The pH of coffee is 9.3, which is acidic or basic.
- If a material has a pH of 9.2, is it acidic orbasic?
- If it is acidic, it is basic.