Investigating Rate of Reaction
I will be studying the rate of reaction between sodium thiosulphate
and dilute hydrochloric acid.
I believe that if I increase the concentration of the sodium
thiosulphate, the rate of reaction will increase, because the
molecules are closer together, so there are more collisions per
second.
I believe if I double the concentration of the sodium thiosulphate
then the rate of reaction will double, because there will be twice as
many sodium thiosulphate molecules in the same area, and so there will
be twice as many collisions.
Using the method on the briefing sheet I carried out preliminary
experiments using measuring cylinders. The times taken for the cross
to disappear are shown bellow:
Vol. of Thiosulphate/cm
Vol. of H O/cm
Time/Sec.
50
0
39
10
40
208
This seemed to be a reasonable range of reaction times so I will study
this range of concentrations.
Method:
Apparatus: -Safety Goggles
-Burette
-Conical Flask
-Measuring Cylinder
-Thiosulphate
-Dilute Hydrochloric Acid
-Water
-Stop Watch
1. Wear safety goggles at all times during the experiment. The
chemicals being used are at low enough concentrations that they are
only dangerous if they get in your eyes and so safety goggles prevent
any risk.
2. Draw a black cross on a plain, white piece of paper and place the
conical flask on it. When the reaction begins the solution will be
clear, when it has finished the solution will have become clouded so
it is no longer possible to see through it. Therefore when the cross
is no longer visible the reaction has finished.
3. Using the burette accurately measure 10cm of hydrochloric acid and
pour it into the conical flask.
4. Using the burette accurately measure 50cm of thiosulphate and add
this to the conical flask.
5. The thiosulphate will immediately begin reacting with the acid;
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