6.2 Acids and Bases

Question 1

What are the properties of acids?

Answer 1

• Corrosive
• Sour tasting
• reacts with metals
• neutralises effects of bases
• releases H+ ions in solutions

Question 2

What are examples of acids?

Answer 2

• Hydrochloric acid
• citric acid
• lactic acid
• carbonic acid

Question 3

What makes an acid strong or weak?

Answer 3

The strength of an acid depends on how easily it can donate it’s hydrogen ions (H+)

Question 4

What are the properties of bases?

Answer 4

• Taste bitter
• can burn
• neutralise effects of acids
• releases OH- ions in solution

Question 5

What are examples of bases?

Answer 5

• sodium hydroxide
• sodium bicarbonate
• toothpaste

Question 6

What makes a base strong or weak?

Answer 6

Strong bases produces lots of hydroxide ions (OH-) in solution. Weak bases produces only a few OH- ions.

Question 7

What is another word for a base?

Answer 7

alkali

Question 8

What is a universal indicator?

Answer 8

A universal indicator indicates whether a substance is an acid or a base. There are two main types of universal indicators: litmus paper and the universal indicator.

When the litmus paper turns red it means it is an acid and when it turns blue it means it is a base.

When the universal indicator turns red it means it is an acid and when it turns purple it is a base. Red means it is a strong acid, orange to yellow means it is a weak acid, green means it is neutral, dark blue means weak base and purple means strong base.