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For example, during your reproductive years (ages 15–49), your vaginal pH should be below or equal to 4.5. But before menstruation and after menopause, a healthy pH tends to be higher than 4.5.

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An acid–base titrator connected to the Internet was developed for conducting remote investigative experiments. The experiment was broadcasted in a high school senior classroom, with the presence of a ...

The photographs below show the results using this pH indicator (pH 6 = Yellow / pH7.6 = Blue). Alternatively, you can use phenolphthalein pH indicator for a more dramatic result.

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At a pH of 7, there are equal numbers of H 3 O + ions and OH − ions in water, and this is called a neutral solution. Acidic solutions have a pH below 7 on the pH scale. Basic solutions have a pH above ...

This is called neutralizing the acid. If an acid is added to a basic solution, the solution becomes less basic and moves toward the middle of the pH scale. This is called neutralizing the base.