Acids and Bases

Question 1

What pH does an acid have?

Answer 1

1-6

Question 2

What pH does an alkali have?

Answer 2

8-14

Question 3

How to measure the pH of a solution

Answer 3

Universal Indicator
pH probe
pH paper

Question 4

What do acids release

Answer 4

H+ ions

Question 5

What do alkalis release

Answer 5

OH- ions

Question 6

What is neutralisation

Answer 6

A reaction between an acid and an alkali to form a neutral substance

Question 7

What is titration

Answer 7

A practical that allows you to find out how much acid is needed to neutralise an alkali (or vice versa) and therefor the concentration

Question 8

Explain the steps of titration

Answer 8

Add 10ml of alkali to a conical flask and add 3 drops of indicator
Add acid of a known concentration using a burette to record the volume of acid you are adding
The indicator will change colour after neutralisation so record the volume once neutralisation has been achieved

Question 9

What indicators should you use during titration

Answer 9

Single indicator
Litmus (blue in alkali and red in acid)
Phenophthalein (colourless in acids and pink in alkalis)
Methyl orange (yellow in alkali and red in acid)

Question 10

What is a strong acid?

Answer 10

Ionise completely in water
All particles release H+ ions