practicals

Question 1

Preparing copper sulphate from copper oxide and sulphuric acid (core practical)

Answer 1

1) add excess copper oxide into warm sulphuric acid
2) when it’s neutral filter the mixture
3) crystallisation

Question 2

Preparing sodium chloride from sodium hydroxide and hydrochloric acid

Answer 2

1) fill a burets to the 0ml line with the acid
2) measure out 10ml of sodium hydroxide with a pipette. add to conical flask
3) add phenolphthalein indicator to alkali, it will go pink
4) turn tap and slowly let the acid into the alkali until it goes colourless
5) repeat and take an average
6) repeat without indicator
7) crystallisation

Question 3

Preparing a pure, dry participate of silver chloride from silver nitrate

Answer 3

1) dissolve silver chloride and silver nitrate
2) mix them together
3) filter the solution/mixture
4) wash with distilled water
5) dry the solid

Question 4

Investigating the change in pH when calcium hydroxide/oxide is added to hydrochloric acid

Answer 4

1) measure 50ml of HCl and add to a beaker
2) use pH paper to measure pH of the acid
3) measure 0.3g of the calcium hydroxide/oxide
4) add together and stir
5) measure pH
6) repeat steps 3-6 until 3g have been added
7) use graph to find the exact mass need to neutralise the acid