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Sodium Thiosulphate Rates Of Reaction Essay

1883 words - 8 pages

Sodium Thiosulphate Rates of Reaction

During this investigation I am going to investigate the rates of
reactions and which changes will affect this rate. A rate of reaction
is when a reactant is lost or a new product is formed during a
chemical reaction. I am going to investigate the effect of
concentration by mixing Sodium Thiosulphate, Hydrochloric Acid and H2O
(water) until the reaction takes place and the mixture goes cloudy and
the newspaper beneath the flask can no longer be read. Both the Sodium
Thiosulphate and the Hydrochloric acid are soluble in water, so the
concentration of either can be changed. However I am going to use
varying ...view middle of the document...

To complete this investigation I think I am going to need to use the
following apparatus and chemicals:

* 3 measuring cylinders

* 1 conical flask

* 1 stopwatch

* Newspaper with the same size print

* 1M Sodium Thiosulphate

* 1M Hydrochloric Acid

* Tap water

I will use the same conical flask throughout to avoid using one that
is of a different size or volume as this could hinder my results and
make them unfair. I will have to clean my flask after each use to
avoid cross contamination from any remaining chemicals from the run
before. For each run I will use 5 cm3 of Hydrochloric Acid and vary
the amount of Sodium Thiosulphate from 50 cm3 to 5 cm3 in decreases of
5 cm3 each time whilst I increase the amount of water from 0 cm3 to 45
cm3 each time again by 5 cm3 every time.

For each run of this investigation I will measure the 3 solutions into
the measuring cylinders, making sure that each is only measured in
their own labelled cylinder to avoid cross contamination. I will cut a
7 cm by 7 cm square of the newspaper, making sure that each time the
print is of the same size and place this under the cleaned conical
flask. I will then pour the solutions into the flask and start the
stop clock. Which I will then stop when I can no longer read the
newspaper print beneath the conical flask. I will keep the conical
flask the same in each experiment; the reasons for this are underlined
above. Also I will always do the experiment at room temperature,
always use tap water and always use the same concentration of Sodium
Thiosulphate and Hydrochloric Acid, I will change the concentration by
diluting the Sodium Thiosulphate with water.

During this experiment I will do the following runs:

· 50 cm3 of Sodium Thiosulphate, 5 cm3 of Hydrochloric Acid, no water
and a concentration of 0.50M.

· 45 cm3 of Sodium Thiosulphate, 5 cm3 of Hydrochloric Acid, 5 cm3 of
water and a concentration of 0.45M.

· 40 cm3 of Sodium Thiosulphate, 5 cm3 of Hydrochloric Acid, 10 cm3 of
water and a concentration of 0.40M.

· 35 cm3 of Sodium Thiosulphate, 5 cm3 of Hydrochloric Acid, 15 cm3 of
water and a concentration of 0.35M.

· 30 cm3 of Sodium Thiosulphate, 5 cm3 of Hydrochloric Acid, 20 cm3 of
water and a concentration of 0.30M.

· 25 cm3 of Sodium Thiosulphate, 5 cm3 of Hydrochloric Acid, 25 cm3 of
water and a concentration of 0.25M.

· 20 cm3 of Sodium Thiosulphate, 5 cm3 of Hydrochloric Acid, 30 cm3 of
water and a concentration of 0.20M.

· 15 cm3 of Sodium Thiosulphate, 5 cm3 of Hydrochloric Acid, 35 cm3 of
water and a concentration of 0.15M.

· 10 cm3 of Sodium Thiosulphate, 5 cm3 of Hydrochloric Acid, 40 cm3 of
water and a concentration of 0.10M.

· 05 cm3 of Sodium Thiosulphate, 5 cm3 of Hydrochloric Acid, 45 cm3of
water and a...

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