RPA'S Flashcards
(4 cards)
Rate of Reaction Practical
1) React marble chips with hydrochloric acid to produce carbon dioxide gas
2) Collect and measure volume of gas produced using a gas syringe
3) Measure volume of gas at regular time intervals
4) Repeat with many different concentrations of hydrochloric acid
5) Control everything else, like temperature, mass of marble chips and volume of acid
6) Start timer straight away and bung straight on top
1) Mix together sodium thiosulphate with hydrochloric acid
2) This will react to produce a cloudy sulphur solution, place within a conical flask, on a white tile with a bold black X
3) Time how long it takes for the X to no longer become visible
4) Repeat with different concentrations of sodium thiosulphate
Water purification RPA?
Water purification is the process of removing impurities from water to make it suitable for drinking. In this practical, you will measure the pH of a water sample, remove impurities by distillation, and check the purity of the water by measuring the boiling point.
Investigating ions RPA?
Flame test - Identifies metal ions by the colours they produce when heated.
Carbonate test - Test for carbon dioxide by turning limewater cloudy.
Sulfates test - Barium chloride forms an insoluble white precipitate when sulphates are present.
Halides test - Halides produce coloured silver halide precipitates when reacted with silver nitrate solution.
Chromatography RPA
1) Take a piece of filter paper and draw a line in pencil at the bottom, called a baseline
2) Add sample of ink to the baseline
3) Fill beaker with shallow amount of solvent
4) Place filter paper into the solvent, DO NOT submerge pencil line and ink
5) Place lid on top to stop solvent evaporating
6) Wait for solvent to seep up the paper and dissolve the dyes within and move up with it
7) Each dye travels up at different rate, separating at different points, insoluble stuff stays at baseline
8) Take it out and you are left with a chromatogram
