Acids and bases make pH indicators turn different colors ... property of a substance and that a color change can also be used as evidence that a chemical reaction has occurred. Students will explore ...

Dawson, H. M., and Spivey, E., J. Chem. Soc., 2180 (1930). Bell, R. P., and Jones, P., J. Chem. Soc., 88 (1953). Swain, C. G., Di Milo, A. J., and Cordner, J. P., J ...

Neutralisation is the reaction of an acid with a base that results in the pH moving towards 7. It is a useful process that occurs in everyday life such as in the treatment of acid indigestion and ...

This pigment is a natural acid-base indicator. It is blue in neutral substances, like plain water. When an acid like lemon juice gets in the water, a reaction makes the indicator molecule change shape ...

A cotton swab is dipped into concentrated hydrochloric acid (producing hydrogen chloride gas) while a second on is dipped into concentrated aqueous ammonia (producing ammonia gas). Both cotton swabs ...