Acid-base indicators change color depending on whether they are ... a different reaction happens that changes the indicator molecule and it looks green. This activity is adapted from an activity that ...

A neutral substance is neither an acid nor a base. Give each student an Activity Sheet (PDF). Students will record their observations and answer questions about the activity on the activity sheet.

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 ...