An acid-base indicator is a substance that changes color as the pH of the solution changes. Indicators work because they are weak acids which when in solution, exist in equilibrium with their ...

A pH or acid-base indicator is a compound that changes color depending ... property of a substance and that a color change can also be used as evidence that a chemical reaction has occurred. Students ...

When additional base is added, the precipitate dissolves. The reactions can then be reversed with the addition of hydrochloric acid. The precipitate will reappear and then redissolve. Turn on stir ...

Red cabbage contains a chemical called anthocyanin. 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, ...

Learn what pH means and how it is measured in this KS3 chemistry guide from BBC Bitesize. Neutralisation reactions Acids ... the name of the acid and metal. Acids and bases Acids, bases and ...

Neutralisation is the reaction between an acid and a base. Electrolysis involves using ... Sample exam questions - chemical changes - AQA Understanding how to approach exam questions helps to ...

There were many theories put forth for explaining the reaction and some bloggers speculated that it is an acid-base reaction because Coke is acidic. In fact, experiments in a 2006 edition of the ...