Indicator and pH QzL

Identify acids, alkalis, and neutral solutions on the pH scale.

• Acids have pH less than 7, alkalis have pH more than 7, and neutral solutions have pH equal to 7.

• Acids have pH more than 7, alkalis have pH less than 7, and neutral solutions have pH equal to 7.

• Acids and alkalis both have pH equal to 7, and neutral solutions have pH less than 7.

• Acids have pH equal to 7, alkalis have pH equal to 7, and neutral solutions have pH more than 7.

Identify the best indicator to distinguish between solutions of different pH.

• Litmus paper

• Phenolphthalein

• Methyl orange

• Universal indicator

Use data and observations to determine the pH of a solution.

• The pH is acidic

• The pH is neutral

• The pH is basic

• The pH cannot be determined

A student has two beakers. One contains an acid and the other contains an alkaline solution. How can he find out which is which?

• By using litmus paper

• By tasting the solutions

• By smelling the solutions

• By shaking the beakers

State what an indicator is.

• An indicator is a device that shows the state or level of something.

• An indicator is a type of fruit.

• An indicator is a musical instrument.

• An indicator is a type of clothing.

Which plants make good indicators?

• Lichens

• Cacti

• Roses

• Sunflowers

What color does red cabbage juice turn in dilute hydrochloric acid?

• red

• blue

• green

• yellow

What color does hibiscus flower juice turn in dilute sodium hydroxide solution?

• dark green

• red

• blue

• yellow

What color does beetroot juice turn in dilute sodium hydroxide solution?

• yellow

• red

• green

• blue

State the colour change when a student adds an acid to blue litmus paper.

• Blue to Red

• Red to Blue

• No change

• Blue to Green