Indicators

What is an indicator?

• A substance that changes colour in acid or alkali.

• A substance that produces hydrogen gas when reacted with acids.

• A substance that is neutral.

• A substance that is always red in colour.

An indicator will ______________ when it is in contact with an acid or base

• Bubble
• Form a new substance
• Change color
• Stay the same color

Examine the results (color change) of the pH paper shown in the picture. What type of substance was tested?

• an acid

• an alkali

• a neutral substance

• none of the above

The pH scale tells how acidic or basic a substance is. The scale goes from _____ to _______

• 1-10

• 0-14

• 1-14

• 1-100

When the cabbage juice indicator comes into contact with acid, the colour changes from_____________________.

When the cabbage juice indicator comes into contact with the cleaning spray, it changes colour from___________________.

Bonus for anyone who can point out what was wrong with the way I described the changes in colour!