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 ...

This educational film explores acid-base indicators and their color changes ... The film explains the chemical reactions involved, particularly focusing on bromothymol blue as an indicator ...

They have also seen reactions in which an acid or a base reacted to change the color of a pH indicator solution. Do you think that the reactions you will carry out may produce a gas? Yes. At least one ...

Several different bases can neutralise acids, and water is always produced as a result of these reactions. Metal oxides and alkalis are two types of base. Basic substances neutralise acids ...