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To find out how the concentration of hydrochloric acid affects the rate of reaction Free essay! Download now

Home > GCSE > Chemistry > To find out how the concentration of hydrochloric acid affects the rate of reaction

To find out how the concentration of hydrochloric acid affects the rate of reaction

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Downloads to date: N/A | Words: 2966 | Submitted: 11-Feb-2012
Spelling accuracy: 99.1% | Number of pages: 9 | Filetype: Word .doc


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To find out how the concentration of hydrochloric acid affects the rate of reaction essay previewTo find out how the concentration of hydrochloric acid affects the rate of reaction essay previewTo find out how the concentration of hydrochloric acid affects the rate of reaction essay preview

Description

To find out how the concentration of hydrochloric acid affects the rate of reaction

Preview

Planning


Aim

To find out how the concentration of hydrochloric acid affects the rate of reaction.

What do I predict will happen?

I predict that as I increase the concentration of the acid, I will increase the rate of reaction. This can be scientifically explained using the ‘collision theory’, which states that two species can only react if their particles collide with each other. According to this theory, not all collisions may trigger a reaction; they need to collide at the correct orientation, and with enough energy for bonds to break.



As the diagram shows, there are twice as many random-moving acid particles in the 2M acid than the 1M acid; however, both the concentrations are in the same volume of water. Therefore, there is more likelihood for the acid particles in flask 2M to collide and react with the particles of the surface of the marble – the rate of reaction is increased in a more concentrated solution.

I can take this a step further and predict that in this case, I believe that the concentration is directly proportional to the rate of reaction. It seems logical to predict this, as having double the amount of acid particles (double the concentration) in the same volume would mean that the likelihood of a successful collision should double, and so there would be double amount of reactions in the same time, and so giving double the rate of reaction.

Components that I will use

Hydrochloric acid is needed as a reactant for the experiments, and will also be my variable (different concentrations of it will be used each time).
Measuring cylinders for the collection of carbon dioxide gas (large) and for the measuring of the acid and water levels (small).
A conical flask as it is needed in order for the reaction’s gas to be collected in a controlled environment.
A bung with delivery (glass) tube for the gas to be transported from the flask to the measuring cylinder without allowing external gasses to enter the flask.
Rubber tubing is needed as it can easily be bent in the water to the bottom part of the measuring cylinder, in order for the gas to be collected inside it.
Water baths – one is needed for the control of acid temperature, while the other will be used for stopping gas from rushing out of the gas-collecting measuring cylinder.
A thermometer to ensure that the temperature of the acid is constant.
Safety goggles in order to prevent acid from destroying live tissue in the eye.
Calcium carbonate (marble chips) is needed as a reactant for the experiments (it will react with the hydrochloric acid).
Water to act as a control and to prevent carbon dioxide gas from rushing out of gas-collecting measuring cylinder.
A pipette to ensure exact ...

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