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What Affects the Speed of Reaction Between Calcium Carbonate (Marble) + Hydrochloric Acid?

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Introduction

What affects the speed of reaction between calcium carbonate (marble) + hydrochloric acid? My aim is to investigate the speed of reaction between calcium carbonate (marble) and hydrochloric acid. I think that changing the concentration of the acid will speed up the reaction rate. I think this because the higher the concentration of the acid the more particles it has to collide with. Powering the marble chip will make the reaction go faster, I can explain this, because the marble chip is powdered the more surface area there is, which means the acid can collide more. The temperature can also make a difference to the experiment. The greater the temperature the more particles will collide because............ I wouldn't use temperature because it is very difficult to keep the correct temperature whilst trying to perform the experiment. The apparatus I am going to use are 1. Hydrochloric Acid 2. A gas syringe to measure the volume of the gas given off. 3. Calcium carbonate (marble chips) 4. A chronicle flask to do the experiment in 5. A stop watch to record the time of the experiment 6. ...read more.

Middle

We must also take our readings at the same intervals throughout the experiment i.e. I will take a reading every fifteen seconds for all of my experiments. I predict that the more concentrated the acid the quicker the reaction will take place, because the more concentrated the acid is then it will make the chips react faster and more hydrogen will be given off in a quicker time. The smaller the stones are, the even quicker the reaction will happen, this is because the acid has a smaller surface area to act upon. Other factors are what kind of water to use for dilution, I could either use water from the tap which is not very pure or it may be too hot or too cold, or I could use distilled water. Tap water may have some things in it which may affect the results. The temperature also could affect the experiment because if heat is applied then the particles would move around more and affect the results ,and then more gas would be made. Results Concentration Time to get to 20cm3 25, 0 56 20, 5 70 15, 10 102 10, 15 183 5, 20 129 Evaluating Evidence I think that the experiment went very well. ...read more.

Conclusion

Analysing Evidence and Conclusions From looking at my results and graph I am able to conclude that the more concentrated the acid the quicker the reaction happened and the more gas was produced. As we look at the graph we can clearly see that in all five results at the beginning the reaction happened more quickly than at the end where we can see that it started to tail off. Before I did the experiments I made some predictions they were that the more concentrated the acid was the quicker the reaction would happen and more hydrogen would be produced. This was completely correct because what I thought would happen did. At this point we are able to answer our main hypothesis which was 'how does changing the concentration of acid affect the rate of reaction between hydrochloric acid and calcium carbonate.' The answer to this would be that changing the concentration of the acid will either make it go slower or quicker and more or less gas would be produced depending on whether the concentrations were more or less. Overall this was a very successful experiment and everything went very smoothly, and that was why my results were very good, and I am able to make a conclusion like this. ...read more.

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