Lab Instuctions For Marble Chips
Lab Instuctions For Marble Chips
Lab Instuctions For Marble Chips
Aim To determine how change in surface area of reactant affects the rate of
reaction. Calcium carbonate and hydrochloric acid will be used.
Procedure
Place 5 g (limiting reagent) of marble chips, CaCO3 (s), in the conical flask
place it on the weighing scale.
Record the total mass.
Procedure
The reaction between sodium thiosulphate solution and hydrochloric acid may
be represented by the equation:
You will be provided with 2.0M hydrochloric acid and 0.15M sodium
thiosulphate solution.
Mark a large cross in pencil on a piece of white paper and place it on the
bench. Pour 50cm3 of the sodium thiosulphate solution into a clean dry
100cm3 beaker and stand it over the cross on the paper. Now add 5cm3 of the
hydrochloric acid to the beaker, stirring the mixture while this is being done,
and start a stop-clock (or note the time on a clock with a seconds hand). Look
downwards through the solution in the beaker at the cross and note the time
when the cross disappears. Record the results.
Clean and dry the beaker and repeat the above procedure using 40cm3
sodium thiosulphate solution mixed with 10cm3 water and add 5cm3 acid.
Again note the time for the cross to disappear.
Repeat the experiment using the other mixtures shown in the table.
Experiment A18.1b
Apparatus
Experiment sheet 73
Conical flask, 100cm3 (labeled “Hydrochloric acid”)
Measuring cylinder, 100cm3
Measuring cylinder, 10cm3
Beaker 100cm3
Beaker, 250cm3 (labeled “Sodium thiosulphate”)
Stirring rod
Stop-clock or watch with a seconds hand
Sheet of white paper
Graph paper
2.0M hydrochloric acid, about 40 cm3
Sodium thiosulphate solution, containing 37 g per dm3 (about 0.15M), about
200 cm3