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Measuring the rate of reaction, when dilute sodium thiosulphate

solution and dilute hydrochloric acid are mixed.

Hypothesis:

I predict that the higher the concentration of sodium thiosulphate,

the faster the rate of reaction.

Aim:

In this experiment I intend to test the collision theory. My aim is to

see if the concentration of sodium thiosulphate will affect the rate

of reaction.

Introduction:

In this experiment I will vary the concentration of sodium

thiosulphate to measure the rates of reaction. I will be mixing

different concentrations of sodium thiosulphate with hydrochloric

acid, the collision theory says the reaction time will alter; this is

what I will be testing.

The collision theory tells us that the larger the surface area, the

faster the reaction. So the higher the concentration the more atoms

there are to react. There are 4 things that affect the rate of

reaction, concentration, surface area, catalysts and temperature.

Concentration can affect the rate of reaction by increasing atoms to

collide with each other. The more atoms there are to collide, the

faster the rate of reaction.

In reactions where gases are involved, if you increase the pressure

the particles will move closer together. The smaller the space in the

container, collisions are more likely to occur. If the concentration

is weaker, this means there are fewer atoms to collide. If an object

has a large surface area, the reaction rate will increase as there is

more surface area for the atoms to collide. I hypothesis that the more

surface area there is the more space there is for the particles to

react.

Catalysts change the rate of chemical reactions but are not used up in

the reaction.

Examples of catalysts are enzymes, clay, and hydrogen peroxide. These

all speed up certain chemical reactions. Enzymes are found in the

human body, they are there to break down food and make digestion time

shorter. Enzymes can also be found in washing powder, to break down

food stains on clothes. Temperature can affect the rate of reaction to

a great extent because particles vibrate more at higher temperatures.

The more they vibrate the more chance there is that they will collide

with another particle, thus causing the rate of reaction to increase.

In a chemical reaction, the reactants collide with each other.

Pressure

This diagram shows us that the more pressure there is the more likely

it is that the particles will collide.

High pressure

Low pressure

More collisions as the particles are closer together

Not many collisions

Marble in dilute hydrochloric acid

This diagram shows us that surface area does have an effect on the

rate of reaction.

1 Large marble cube Marble

cube split into 6 pieces

In the experiment I carry out, I will change the concentration and see

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