Acid-Base Indicators

Indicators are used to test if a solution is ________________

• Sweet or Sour

• Acidic or Basic

• Fresh or Bitter

• Sour or Bitter

Acid-Base indicators can tell the difference between an acid or base based on the change in ___________

• Smell

• Colour

• Taste

• Feel

Litmus paper changes colour to ___________ in an acid.

• Blue

• Green

• Yellow

• Red

Litmus paper changes colour to ___________ in an alkaline.

• Blue

• Green

• Yellow

• Red

Phenolphthalein changes colour to ___________ in an acid.

• Colourless

• Blue

• Pink

• Yellow

Phenolphthalein changes colour to ___________ in an alkaline.

• Colourless

• Blue

• Pink

• Yellow

Methyl Orange changes colour to ___________ in an acid.

• Green

• Blue

• Red

• Yellow

Methyl Orange changes colour to ___________ in an alkaline.

• Green

• Blue

• Red

• Yellow

How many times can a universal indicator change colour?

• One

• Two

• Three

• More than three

Which of the indicators below can tell how acidic or basic a solution is?

• Phenolphthalein

• Methyl Orange

• Universal Indicator

• Litmus Paper