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What are some factors that influence the rate of reaction
Rates of reaction and what affects them
Rates of reaction and what affects them
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Reaction of Hydrochloric Acid and Sodium Thiosulphate
In this investigation I am going to investigate how fast the chemicals
Hydrochloric Acid and Sodium Thiosulphate react. The four main
variables that affect rate are:
* Temperature - if the reactants are heated/cooled they have
more/less energy. If they have more energy there is greater
chances of successful collisions meaning the reaction occurs
faster.
* Concentration - if the solution is more concentrated there are
more reactants there is a greater chance of successful collisions.
* Surface Area - if one reactant has more surface area there is
greater chance of a successful collision as there is more area for
the reaction to occur on.
* Catalysts - a catalyst is a chemical that speeds up a reaction
without changing itself during the reaction. An example of this is
an enzyme.
In this investigation however I am only going to investigate how
concentration affects rate of reaction as the other methods of
increasing the rate of reaction are not easily controlled and I do not
know of a catalyst that will speed up the reaction.
Preliminary Work
----------------
In this preliminary work I am going to investigate the two extreme
possible measurements.
In this preliminary work I placed 20cm³ of Hydrochloric acid and 20cm³
of Sodium Thiosulphate into a conical flask over a cross on a piece of
paper. I then measured the time for it to no longer be visible when
viewed from above. I also did 1cm³ of hydrochloric acid, 19cm³ of
water and 20cm³ of Sodium Thiosulphate.
Concentration of Hydrochloric Acid
Time for cross to disappear
0.2 M
1.27
0.01 M
took too long
As the concentration 0.01M took such a long time I may not repeat it