Acid and Base Litmus

What is the pH of distilled water?

• pH 12

• pH 3

• pH 8

• pH 7

What colour does litmus paper turn when added to an alkali?

• Blue

• Red

• Green

• Colourless

What colour does litmus paper turn when added to an acid?

• Blue

• Red

• Green

• Colourless

Tap water...

• turns red litmus blue and blue litmus remains blue

• turns blue litmus red and red litmus remains red

• does not affect both red and blue litmus papers

• turns red litmus blue and blue litmus red

Pure water has a pH of 7. Pure water _______.

• is a base
• is a neutral substance
• could be either an acid or a base
• is an acid

• PH scale

• pH ruler

• pH scale

• pH statistical tables

Vinegar, fruit juice, and cola are examples of:

• strong acids

• strong bases

• strong bases

• weak acids

Neutral solutions have a pH of:

• 0

• 1

• 7

• 14

_{What is the hazard shown in this hazard sign?}

• Explosive

• Corrosive

• Irritant

• High level Irritant

To make acids safer to use in schools we often.....

• freeze them

• keep them with the lid off

• don't use them

• dilute them

Tags

NGSS.MS-ETS1-1