The Effect of the Concentration of Acid on the Rate of Reaction

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The Effect of the Concentration of Acid on the Rate of Reaction

Aim:

To find out how the concentration of an acid affects the rate of

reaction.

I am reacting different concentrations of HCL acid with the same

concentration of sodium thiosulphate.

I predict the HCL acid which is 2m, will react faster with the sodium

thiosulphate. I know this because of concentration, all the particles

have kinetic energy and in order for a chemical reaction to occur,

particles in a solution need to collide into one another with

sufficient force and energy. Now in a solution of HCL acid 0.5m and

sodium thiosulphate the collisions would be minimum because of not

enough concentration but in a solution of HCL acid 2m and sodium

thiosulphate the collisions would be very high because of quite a lot

of concentration.

[IMAGE][IMAGE][IMAGE][IMAGE] 0.5m 2m

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Concentration

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Not many collisions

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More collisions

Same area

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[IMAGE] =Sodium thiosulphate

=HCL acid particles

Fair test

---------

These variables I will control are the temperature, I will keep the

temperature the same because heat energy makes the kinetic energy of

the particles increase so if I would repeat the test, time for

reaction would be different. I will also control the volume of HCL

acid which is 5ml and sodium thiosulphate which is 30ml because if I

was to repeat the test with different volumes the result time would

also be different.

Ranges of acids: 0.1,0.2,0.5,1.0,1.5,2.0

----------------------------------------

Plan

----

Apparatus list

--------------

Conical flask, paper with x on it, goggles, measuring cylinder x2

Method

1. Set up the apparatus as shown in my diagram.

2. Measure 30ml of sodium thiosulphate in a large measuring cylinder

and pour it into the conical flask.

3. Measure 5ml of HCL acid in a small measuring cylinder and pour it

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