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The affect of HCL on CaC03.

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Introduction

The affect of HCL on CaC03 In my investigation, the one thing that I shall change by equal amount each time is the concentration of Hydrochloric acid. In my investigation, the thing I shall measure (that is affected by the change) is the time it takes to collect a certain amount of gas. To make the investigation a fair test, here is a list of things that I'm going to keep the same: o Same mass of marble chips ~ mass being: 0.2g o The surface area of the marble chips o I will collect the same amount of gas o I will use the same amount of acid (not the same concentration) Apparatus - here is a list of everything I shall need to do my investigation: o Two clamp stands o Measuring cylinder o Beehive o Conical flask o Rubber glass tubing o 0.2, 0.5, 1, 1.5 and 2 m acid o Marble chips My prediction - what I think will happen: I predict that as the concentration of the hydrochloric acid increases, the rate of the reaction will increase as well. ...read more.

Middle

o The surface area of marble chips. The bigger the surface area is, then the faster the rate of reaction because there is more of the substance for the particles to collide with. Method: After I have set up all my equipment up safely and made sure that it will be a fair test I will: * I will Measure 10cm� of HCl (hydrochloric acid) * Then I will measure 0.2g of CaCO3 * I will empty the 0.2g of CaCO3 in a conical flask * Then I will Add HCl to the CaCO3 * Start the stopwatch * I will then see how long it takes for the conical flask to fill up with gas. The faster it happens then the faster reaction. I will then record the results in a table. * I will then repeat the experiment 3 times with the same concentrated acid so I can take an average to plot the graph. ...read more.

Conclusion

I believe this is due to simply human error. Despite that minor error, the results I gained were enough to support my prediction. Accuracy My results were not entirely accurate as I didn't get the same readings after repeating the investigation 3 times. Also, I had 2 minor anomalous readings due to human error. I could resolve them, or make it more accurate by 2 people taking the time and 1 person watching the experiment. I could have extended my results by using more and less concentrated hydrochloric acid. The pattern I can see is that of my theory. The increase of concentration of hydrochloric acid affects the rate of reaction. The results I got were accurate enough to make a firm conclusion. Improvements I would have changed the method to suit the experiment more, by doing the investigation over a longer period of time as this would make a clearer conclusion with more evidence. I would also get more people to take the time of the experiment; this could affect the overall conclusion and would be more accurate. ...read more.

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