Реферат: Rate Of Reaction In Sodium Thiosulphate And

1 pair of tongs

1 pair of goggles

1 apron

Method: –

Experiment 1 – Changing the concentration

5 cm3 of HCl (at concentration 1 mol./dm3) and 15 cm3 of sodium thiosulphate

(at varying concentrations ? 10 to 35 g/dm3) are poured out into two measuring

cylinders and then poured into a conical flask, which is placed on top of a

board marked with letter X. The stopwatch will now be started. When the mixture

has turned sufficiently cloudy so that the letter X can no longer be seen the

stopwatch will be stopped and the time will be recorded. The experiment is

repeated with all the concentrations. The whole procedure is then repeated.

Experiment 2 ? Changing the temperature

5 cm of HCl (at concentration 1 mol./dm3) and 15 cm of sodium thiosulphate (at

varying concentrations ? 10 to 35 g/dm3) are poured out into two measuring

cylinders. A beaker is half filled with hot water from a tap. The water is

placed on top of a Bunsen on a blue flame and the two measuring placed inside

the water bath. The water is heated to the necessary temperature (30°C to 70°C)

then the two measuring cylinders are taken out and the contents of both are

poured into a conical cylinder. The time it takes for the X to disappear is

timed and recorded. The experiment is repeated using all the temperatures. The

entire procedure is the repeated.

Repeat results and averages will be taken to improve the credibility of the

findings, and present solid grounding for the final conclusion. The repeat

results will help to iron out any anomalies and the average will give a good

summary of the results of the experiment. However if one set of results is

entirely different to the other, a third experiment will be performed to

replace the anomalous set of results.

Safety ? A pair of goggles will be worn during the heating part of the