Acids and Alkalis/Indicators

A substance which has no effect on litmus paper is

• pure water

• Hydrochloric acid

• sodium hydroxide

An acid turns

• red litmus blue

• blue litmus red

• has no effect on litmus paper

An alkali turns

• blue litmus paper red

• red litmus paper blue

• has no change on litmus paper

A has a pH of 2. A __________ can be used to determine the pH

• Litmus paper

• Universal indicator

• red cabbage leaf extract

The ____________ shows how acidic or how alkaline a substance is.

• pH scale

• methyl orange indicator

• litmus paper

Bleach and soap are classified as

• acid

• alkali

• neutral

Acetic acid turns yellow in Universal indicator. What is the pH of acetic acid?

• 3

• 2

• 4

This instrument can be used to determine the pH of the soil for agricultural use.

• pH scale

• pH meter

• measuring cylinder