To study the factors which will effect the rate of reaction between Calcium carbonate (marble chips) and Hydrochloric acid.

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Jessica Scott 5S.

 To study the factors which will effect the rate of reaction between Calcium carbonate (marble chips) and Hydrochloric acid.

Skill Area P:

Aim: To study the factors which will effect the rate of reaction between Calcium carbonate (marble chips) and hydrochloric acid.

Factors which will effect the rate of reaction: 

  • concentration
  • temperature
  • surface area
  • catalyst (there are none for this experiment)

The student has chosen to use concentration as the only variable for this experiment.

Prediction.

The student predicts that the more hydrochloric acid that is used, the faster the rate of reaction will be. This is due to the fact that when there is a higher concentration of acid being tested, there are more molecules in the solution and there will be more collisions of these molecules. Due to this there will be more chances of successful collisions and the rate of reaction will be quicker than if the concentration of the solution was small as this would mean there would not be as many molecules to collide making it less likely that the collisions will be successful and making the rate of reaction slower.

Low concentration (the reaction is slow due to there being less movement therefore less colliding molecules in the solution.)

High concentration (the reaction is fast due to there being more molecules moving in the solution therefore there are more molecules colliding with each other and the reaction becomes faster.)

Introduction:

The equation for this experiment is as follows…

CaC03 (s) + 2HCl (aq)  CaCl2 (aq) + H20 (l)

We see that in the experiment carbon dioxide is given off. This is an advantage as it enables the reaction to be followed easily. If the amount of carbon dioxide is measured we will be able to identify the rate of reaction taking place.

Experimental procedure:

Before the experiment to study the factors which effect the rate of reaction between calcium carbonate (marble chips) and hydrochloric acid was carried out, a preliminary experiment was carried out so that the student could find out which size of marble chips to use, and so that they could find out what would be the right amount of solution to use in the experiment. The student tried using a number of different amounts of concentration ranging from 50ml to 150 ml. Results were obtained and it became obvious that 50ml was probably the best amount of solution to use as if there was a greater volume, the reaction would go on for too long when the solution was strong. Therefore 50ml of solution was used each time the test was carried out.

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 The experiment was carried out using 25ml hydrochloric acid and 25ml calcium carbonate. The student tested the solution three times, once using small marble chips, once using medium ones, and once using large ones. The student decided to use medium marble chips in the actual experiment because they were of average size. The experiment was carried out using various different amounts of marble chips ranging from 2g to 10g. After the results showing that the more marble chips that were present, the faster the reaction would go, the student decided to use 5g of marble chips to allow enough ...

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