Making Salts

Question 1

Method for making soluble salts ( insoluble base method)
Doesn’t contain Na or Nh4 or K

Answer 1

• heat acid
• stir and add base until no more base will dissolve
• filter excess base
• heat salt solution until crystals begin to form
• allow solution to cool
• filter out crystals
• dry with a paper towel

Question 2

Making soluble salts ( titration method )

Answer 2

• perform titration to measure the volumes of acid and alkali neutralise eachother
• repeat titration but don’t put any indicator in to add exaclty right amount of volume
• heat salt solution until crystals start forming
• allow to cool
• filter crystals
• dry with paper towel

Question 3

Making insoluble salts by precipitation

Answer 3

• make salt from precipitation
• filter out salt precipitate
• rinse with water
• dry by dabbing paper towel

Question 4

Titration equipment

Answer 4

• volumetric pipette ( measures exaclty 25cm3 )
• buirrete

Question 5

Titration method

Answer 5

• use volumetric pipette to measure 25cm3 of unknown alkali
• add drops of phenolphthalein
• fill buirette with known acid and clamp above flask
• measure initial volume of known acid on buirette
• use buirette to add acid into conical flask
• close tap as soon as colour begins to change
• measure the final volume of acid on buirette
• calculate titre

Question 6

how to obtain a sample of pure dry hydrated copper sulphate from copper oxide

Answer 6

• measure 25cm of sulfuric acid
• warm the acid using a bunsen burner
• add in copper oxide and stir until it is in excess
• filter the mixture
• heat the filtrate
• until crystals begin to form
• filter to remove crystals
• dry crystals on paper towel