Реферат: Rate Of Reaction In Sodium Thiosulphate And

Hydrochloric acid are soluble in water, so the concentration of either can be

changed. However I have chosen to vary the sodium thiosulphate as it is

available in larger amounts, and various concentrations are prepared. When the

temperature is constant room temperature will be used as the temperature as it

more practical and will not need to be monitored. When the temperature is being

varied a water bath will be used to heat up the acid and thiosulphate to the

necessary temperature.

I decided which temperatures and concentrations to use during my preliminary

series of experiments ?

1 mol/dm3 of HCl (acid concentration will be fixed)

10-35g/dm3 of sodium thiosulphate (all of these concentrations will be tested

in turn going up in steps of 5g/dm3)

20-70°C temperature (all of these temperatures will be used going up in steps

of 10°C)

Concentrations of 5, and 40 g/dm3 of thiosulphate were available to me but my

preliminary work showed that the 5 g/dm3 and 40g/dm3 were too slow and fast

respectively in reacting to be worth testing. Similarly any temperature below

20°C reacted too slowly, and 80°C and 90°C reacted too quickly to be worth

including in my final results.

Using my preliminary experiments I decided on using the following apparatus:

1 thermometer

1 beaker

2 measuring cylinders

1 conical flask

1 tripod

1 gauze

1 heatproof mat

1 stopwatch

1 Bunsen burner