Module 2 chapter 4 - Acids And redox

Question 1

Explain what is meant by the terms base and alkali

Answer 1

Base - a substance which readily accepts H+ ions from an acid
Alkali - releases OH- ions into aqueous solution

Question 2

When do we know whether it is a redox or neutralisation reaction

Answer 2

If reactant is 
Metal oxide
Metal hydroxide 
Metal carbonate 
Then it is neutralisation otherwise redox

Question 3

How do you work out percentage uncertainty?

Answer 3

Uncertainty / measurement made on apparatus * 100

Question 4

The student is not confident that their titre is accurate. Suggest what the student should do next to reduce the effect of any random error in the titration

Answer 4

Repeat until 2 titrations are concordant then calculate mean for this

Question 5

What is the name of the redox reaction when the element is being both oxidised and reduced.

Answer 5

Disproportionation

Question 6

What is meant by acid and weak acid?

Answer 6

Acid releases H+ ions

Weak acid partially dissociates

Question 7

What is meant by the term standard solution?

Answer 7

A solution of known concentration

Question 8

What is meant by the term alkali?

Answer 8

Releases OH- ions in aqueous solution

Question 9

State 1 disadvantage of using chlorine for the purification of drinking water.

Answer 9

Chlorine is toxic