Rates Of Reaction: Sodium Thiosulphate + Hydrochloric Acid

1492 words - 6 pages

Rates of reaction:- sodium thiosulphate + hydrochloric acid

Plan:-

We must produce a piece of coursework investigating the rates of
reaction, and the effect that changing one particular variable has on
the reaction time. The rate of reaction is the time it takes one or
more of the reactants to react or the time it takes to produce a new
product from a chemical reaction. To work out the reaction time we use
the formula.

1 divided by time taken for reaction

There are five factors which affect the rate of a reaction, according
to the collision theory of reacting particles:

1. temperature of solution,
2. concentration of solution,
3. pressure of gases in reaction,
4. ...view middle of the document...

Na2S2O3 (aq) + 2HCl (aq) .

As I decided after my preliminary experiments I will only carry out
one experiment, temperature change whilst all other variables stay
constant. As both, sodium thiosulphate and hydrochloric acid are
soluble in water it means that I would be able to alter the
concentration of either of them. However I have chosen to vary the
sodium thiosulphate as it is available in larger amounts. To alter the
temperature of the solution a water bath will be used to heat up the
acid, thiosulphate and water to the necessary temperature.

I decided on my range temperatures and the concentration that I would
use during my preliminary series of experiments -

I would be using a concentration of 0.25 mole:-5cm³ hydrochloric acid

5cm³ water

10cm³ sodium thiosulphate

I will also be using a range of 5 temperatures:- 30ºC, 40ºC, 50ºC,
60ºC and 70ºC

I have chosen to use these ranges of temperatures and concentration
because a weaker concentration took to long and a stronger
concentration was to fast. I have chosen the range of temperatures
because they give the best range of results.

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

2 thermometer
1 beaker
2measuring cylinders
1 conical flask
1 stop clock
1 water bath
1 piece of card with cross in center
1 pair of goggles

Method:-

First I will measure out 5cm³ of hydrochloric acid into a measuring
cylinder. I will then place it in to a pre-heated water bath and place
a thermometer into the acid. I will then measure out 10cm³ of
thiosulphate and 5cm³ of water into a measuring cylinder. I will then
place a thermometer into the diluted thiosulphate and place it in to
water bath. While the acid and thiosulphate solution are heating up I
will place a conical flask on to a piece of a card which has a large
black cross drawn on its center. Once the acid and thiosulphate have
reached the temperature of the water bath that they're in, room
temperature -70ºC. I will pour them into the conical flask and start
the stop clock. I will look at the solution and when it turns to
cloudy to see the cross at the bottom of the conical flask I will stop
the stop clock. I will repeat this process three times for each of my
six temperatures.

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
experiment in order to protect the eyes. I would ideally like to wear
an apron to protect the skin and clothing but none are available for
use so I will just have to careful when heating and...

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