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Investigate The Rate Of Reaction Between Calcium Carbonate And Hydrochloric Acid At Different Concentrations

989 words - 4 pages

Investigate the rate of reaction between Calcium Carbonate and Hydrochloric Acid at different concentrations

Aim:

To Investigate the rate of reaction between Calcium Carbonate and
Hydrochloric Acid at different concentrations.

Background Knowledge:

I know from my knowledge of science, that by adding together a
carbonate and an acid, that a salt, water and Carbon Dioxide are
produced. Therefore in order to measure the rate of reaction, one of
these products needs to be measured, and the rate at which it is
produced can be used to define the rate of the reaction. The methods
that can be used are either to measure the mass of the solution at
intervals. Or to measure the produce of gas (Carbon Dioxide).

Prediction:

Using the known formula:

ACID + CARBONATE SALT + CARBON DIOXIDE + WATER

I can predict the reaction of my experiment to be:

HYDROCHLORIC + CALCIUM à CALCIUM + WATER + CARBON

ACID CARBONATE CHLORIDE DIOXIDE

The Chemical Formula is listed below:

2HCl + CaCO3 CaCl2 + H20 + CO2

I think that as the molarity of the acid goes up, the amount of gas
produced will also go up.

I have based this on my knowledge that calcium carbonate does not
react in water. Therefore in solutions with little acid and more
water, the calcium carbonate will not react as much as it would in
pure acid for example. To make each of the different strengths of the
acid, water is added to a solution of 2M hydrochloric acid. Therefore
in the 0.2 value, there will be a lot of water, and so it is not
expected that much gas will be produced.

My predicted graph shows what I expect. On the x-axis, as the molarity
increases, the gas produced on the y-axis does likewise. However there
will be a point reached where the maximum limit of gas has been
produced, and so the line will even off, it is unsure whether this
value will be reached within my experiment.

Increasing the molarity of the acid, will result in more gas being
produced simply because there is a higher concentration of acid, thus
more acid molecules within the solution. This will mean that the acid
molecules with react with the calcium carbonate more often than a
lower molarity solution. With more collisions, the chance of a
reaction occurring also increases, and so with more reactions, more
gas will be produced. However, it is only the chance of reacting that
is increased, and therefore it is not definite that a reaction will
take place, which is likely to be responsible for any anomalous
results.

I need a minimum of six values. These will give a distinguishable
spread whilst remaining within a safe range

Volume of Gas (Outcome)

To be measured

This will be able to be easily measured using a syringe and so should
give accurate results

Time (Controlled)

10 seconds

Through preliminary work, it has been seen that this is sufficient to
get results which can be easily read off apparatus

Volume of Acid (Controlled)

50cc

This volume remains within the safe limit, whilst still allowing a
good range of...

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