pH scale and indicators

Which pH could belong to a strong acid?

• 14

• 8

• 5

• 1

Which pH could belong to a strong alkali?

• 14

• 8

• 5

• 1

Which pH could belong to a weak acid?

• 14

• 8

• 5

• 1

Which pH could belong to a weak alkali?

• 14

• 8

• 5

• 1

Which pH is neutral?

• 14

• 7

• 4

• 2

Which ion do all acids contain?

• Cl^-

• OH^-

• H⁺

• Na⁺

Which ion do all alkalis contain?

• Cl^-

• OH^-

• H⁺

• Na⁺

What is an indicator in Chemistry?

• Chemical dyes that can change colour according to pH

• A small light bulb on a car

• A chemical involved in a chemical reaction

• A substance used to neutralise an acid

How can you measure the pH of a substance?

• Use a pH probe

• Use universal indicator

• Use litmus paper

• Use phenolphthalein

What are the two products of a neutralisation reaction?

• Acid

• Alkali

• Salt

• Water