5.6 Indicators and pH scale [Must do]

The pH scale is a range from:

• 1-7
• 0-14
• 1-5
• 1-20

An acid’s pH is between :

• 0 to 6

• 7

• 8-14

• 6-14

The pH scale 8-14 are...

• acids

• alkali

• neutral

A solution with a pH of 7.0 would be...

• Acid

• Alkali

• Neutral

• Acid and Alkali

What is the only substance with a neutral pH of 7?

• Milk
• Orange Juice
• Water
• Blood

In a test of pH levels, a baking soda has a pH of 9 and bleach has a pH of 12. What is true about there relationship?

• Both of the solution are alkalis

• Both of the solution are acids

• The Baking soda is an acid and the Bleach is an alkali

• The baking soda is an alkali and the Bleach is an acid.

According to the pH range which substance is more acidic than lemon juice

• Hydrochloric acid
• cabbage
• milk

Which of the following is the strongest base?

• 4

• 14

• 7

• 15

This piece of pH paper has been dipped into:

• An acid

• An alkali

• A neutral substance

What happen when acidic subtances are tested with litmus paper?

• Blue litmus paper change to red

• No change on red litmus paper

• No change on blue litmus paper

• Red litmus paper change to blue