CWCC Sci 2B chp 9.2

Why can red cabbage extract be used as a natural indicator?

• it contains litmus

• it contains pigments

• it is acid

• it is alkaline

What is litmus extracted from?

• apple

• orange

• lichen

• rose

What is a blue litmus paper tested for?

• acid solution

• alkaline solution

• water

The more acidic the substance, the ( lower / higher) the pH value.

If the universal indicator is used to test some distilled water, what would the colour be?

• red

• orange

• green

• blue

Which one can measure the pH value more accurately?

• litmus paper

• pH paper

• universal indicator

• pH meter