required practicals Flashcards
Making Salts
1) Pour 40cm cubed of 1.0 M sulphuric acid into a 100 cm cubed beaker
2) Set up your Bunsen burner on a heatproof mat with a tripod and gauze over it.
3) Place the beaker with the acid on the gauze and heat gently over a gentle flame until almost boiling
4) Fold and place a filter paper inside a funnel and filter the blue copper Sulfate solution into a conical flask.
5) Pour the copper sulphate solution into the evaporating basin and heat over a 250cm cubed beaker acting acting as a water bath until it has evaporated
6) Test the solution by dipping a clean glass rod into it and then letting the rod cool.
7) when small crystals form stop heating the solution
8) Use tongs to pour the copper Sulfate solution into a crystallising dish and leave it in a warm place to finish crystallising
Electrolysis
1) Measure 50cm cubed of copper (II) chloride solution and pour into a beaker.
2) Place the lid with carbon rods over the beaker OR attach the carbon rods to the edge of the beaker using crocodile clips. THE RODS MUST NOT TOUCH EACH OTHER
3) Attach leads to the rods and connect the rods to the direct current(red and black terminals) of a power pack.
4) Set the potential difference at 4V and switch on for
5 minutes max
5) After 30 seconds observe the electrodes there might be a gas or a deposit on the electrodes
6) After 5 minutes examine the surface and switch off the power supply
7) Then rinse with distilled water not tap water
Titration
1) Use the pipette and pipette filler to add a measured volume of sodium hydroxide solution to a clean conical flask.
2) Add a few drops of indicator and put the conical flask on a white tile.
3) Fill the burette with hydrochloric acid and note the starting volume.
4) Slowly add the acid from the burette to the alkali in the conical flask, swirling to mix.
5) Stop adding the acid when the end-point is reached (when the indicator first permanently changes colour). 6) Note the final volume reading.
