pH Scale

Question 1

What number is neutral on the pH scale?

Answer 1

The number 7.

Question 2

What substances are neutral on the pH scale?

Answer 2

Water

Blood

Question 3

What colour means neutral on the pH scale?

Answer 3

Dark(ish) green

Question 4

What number is a strong acid on the pH scale?

Answer 4

The number 1.

Question 5

What substance is a strong acid on the pH scale?

Answer 5

Stomach acid

Question 6

What colour means a strong acid on the pH scale?

Answer 6

Dark orange

Question 7

What number is strong alkaline on the pH scale?

Answer 7

The number 14.

Question 8

What substance is a strong alkaline on the pH scale?

Answer 8

Drain cleaner

Question 9

What colour is a strong alkaline on the pH scale?

Answer 9

Dark purple

Question 10

What numbers are weak acids on the pH scale?

Answer 10

The numbers 3-6.

Question 11

What substances are weak acids on the pH scale?

Answer 11

Orange juice
Tomato
Black coffee
Urine

Question 12

What colours are weak acids on the pH scale?

Answer 12

Light orange (orange juice)
Yellow (tomato)
Lime green (black coffee)
Green (urine)

Question 13

What numbers are weak alkalis on the pH scale?

Answer 13

The numbers 8-11.

Question 14

What substances are weak alkalis on the pH scale?

Answer 14

Sea water
Baking soda
Indigestion tablet
Ammonia solution

Question 15

What colours are weak acids on the pH scale?

Answer 15

Turquoise (sea water)
Light blue (baking soda)
Indigo (indigestion tablet)
Light purple (ammonia solution)

Question 16

What is universal indicator and what does it do?

Answer 16

Universal indicator is one of the indicators used to measure pH. It can show us whether something is an acid or an alkali. It can also show us how acidic or alkaline something is.