Topic 5 - 5.2 - Acids and Bases

Question 1

1. soluble non-metal oxides produce…
2. soluble metal oxides produce…

Answer 1

1. …acids when dissolved in water.
2. …alkalis when dissolved in water

Question 2

Describe the ratio of H+ ions and OH- ions in
* alkalis
* acids

Answer 2

• Alkalis = greater concentration of hydroxide ions compared to hydrogen ions.
• Acids = greater concentration of hydrogen ions compared to hydroxide ions.

Question 3

An acid is diluted in water. What will happen to the ion concentration and the pH of the solution?

Answer 3

Concentration of H+ ions is decreased, pH increases towards 7.

Question 4

Define a base

Answer 4

A substance that can neutralise acids by reacting with the H+ ions.

Question 5

An alkali is diluted in water. What will happen to the ion concentration and the pH of the solution?

Answer 5

Concentration of OH- ions is decreased, pH decreases towards 7.

Question 6

Are acidic and alkaline solutions able to conduct electricity? Explain your answer

Answer 6

Yes, because they have ions that are free to carry charge.

Question 7

The more concentrated an acid or alkali…

Answer 7

…the better it conducts.

Question 8

Define an alkali

Answer 8

Any base substance that dissolves in water to produce OH- (hydroxide) ions and neutralise acids.

Question 9

Define an acid

Answer 9

Substance that produces hydrogen ions, H+(aq), when dissolved in water

Question 10

Definition of a salt?

Answer 10

Hydrogen ions in the acid that have been replaced with metal ion/s or ammonium ion/s