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Compare how changing the concentration of hydrochloric acid affects the time taken for each experiment.

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Introduction

To compare how changing the concentration of hydrochloric acid affects the time taken for each experiment. Aim: To look how different concentrations affect the time in each experiment. I will be using concentrations: 3 Molar, 2.5M, 2M, 1.5M and1M. I will not change the amount of marble chips used in each experiment, but I will be changing the size of marble chips, large and small chips will be used. The aim of the experiment is to see if the size of chips and different acid concentrations affect the results. I think that the smaller limestone chips will produce the greater amount of carbon dioxide than the larger chips, as there will be a greater surface area for the acid to react upon. ...read more.

Middle

* � Wear goggles at all times. * � Be careful dropping limestone into glass beakers. Equipment: * Stop Watch * Plastic Clip * Metal Stand * Bowl * Water * Burette * 1grm of small and large marble chips for each experiment * Concentrations of 3M, 2.5M, 2M, 1.5M and 1M * Measuring Cylinder * Scales * Delivery Tube * Bung * Conical Flask Method * Set up apparatus as shown in diagram. * Weigh the correct mass of limestone. * Add acid to the limestone and record the change in mass. * Repeat for each chip size. Results NOTE: Results were recorded in groups Using 1 gram of small marble chips Concentration of acid Time taken 3 molor 2.5 molor 2 molor 1.5 molor 1 molor 1st attempt 0.41 mins 0.55 mins 1.10 mins 1.31 mins 2.01 ...read more.

Conclusion

The larger chips have a smaller surface area and don't decrease as much in mass. Although the larger block may have the same mass as the four small ones put together, the larger chips have a smaller surface area. However there were problems with the experiment because some of the water could condense. Also there could be some human error, making inaccurate timing and starting the stopwatch mass making an unfair test. Evaluation My experiment went well. There doesn't seem to be any odd results on the graph. If I were to retake this experiment again I would consider a more accurate measuring device to measure out the substances exactly as well as calculating a better time reading a better time reading of each test. I would also consider experimenting with different masses of marble chips. A change in temp would also be a interesting development to see what happens and what effect it would have. ...read more.

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