Practicals Flashcards
What is the aim of this practical?
(Making Salts)
To prepare a pure, dry sample of a soluble salt from an insoluble oxide or carbonate.
What happens when acids react with metals, bases and carbonates? (Making salts)
They produce salts.
What equipment is used to heat the acid?
(Making Salts)
A Bunsen burner.
What is used to separate out the unreacted copper (II) oxide? (Making salts)
Filtration with filter paper and a funnel.
What is used to evaporate the solvent?
(Making salts)
A Bunsen burner heating an evaporating basin.
Where should the evaporating basin be left to allow crystals to form? (Making salts)
In a cool place for at least 1 day.
How are the crystals dried?
(Making salts)
By gently patting them dry between two pieces of paper.
What should be done with the Bunsen burner when not in use? (Making salts)
Turn it off or leave it on the safety flame.
What is produced when sulfuric acid reacts with copper (II) oxide? (Making salts)
Copper sulfate solution.
What is neutralisation?
Neutralisation is when an acid reacts with an alkali.
What is a titration?
(Neutralisation)
A titration is a technique to accurately measure the volume of acid needed to neutralise an alkali.
What equipment is used in a titration?
(Neutralisation)
Pipette and filler
Burette
Funnel
Clamp and stand
Conical flask
White tile
What is the aim of this titration?
(Neutralisation)
To determine the volume of sulfuric acid needed to neutralise 25cm^3 of sodium hydroxide.
What is used to detect the end-point?
(Neutralisation)
The colour change of phenolphthalein indicator from pink to colourless.
How is concentration calculated?
(Neutralisation)
Concentration = moles / volume
Where:
- Concentration is measured in mol/cm3
- Moles are measured in mol
- Volume is measured in cm3
How many repeats should be done?
(Neutralisation)
3 repeats and then calculate the mean titre volume
