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

What will happen to the ion concentration and pH of the following when they are dissolved in water?:
* acid
* alkali

Answer 3

• Concentration of H+ ions is decreased, pH increases towards 7.
• Concentration of OH- ions is decreased, pH decreases towards 7.

Question 4

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

Answer 4

• Yes, because they have ions that are free to carry charge.
• More concentrated acids/alkalis conduct electricity better

Question 5

1. Define an alkali
2. Define an acid
3. Define a base

Answer 5

• Any base soluble in water that produces OH- (hydroxide) ions when dissolved and neutralises acids.
• Substance that produces hydrogen ions, H+(aq), when dissolved in water
• Substance that can neutralise acids by reacting with the H+ ions.

Question 6

Definition of a salt?

Answer 6

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