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Marble Chips And HCL.

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Introduction

Marble Chips And HCL Safety- must always wear safety glasses and we should be very careful not to drop any acid. Fair test- we must make sure that we use the same size, amount and roughly the same mass of chips, this is because we want to keep the chips roughly the same all the way through the experiment so that it will be a fair test and the results we be in relation to each other, otherwise the results will be completely different to what we will expect and it will ruin the experiment. 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. ...read more.

Middle

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. I think I will need one result for each concentration and later if I need to repeat any experiments I can do. To get the best results I need to use the equipment in the best possible way. Some ways of doing this would be to twist the gas syringe back and forth so as to not get the syringe stuck, which could affect our results. Another thing would be to sieve the chips so to get the best marbles we can. An important point is that I must get the right amount of acid and the best size and amount of marbles, because if for 4mol if I used about 4 chips then too much gas will be produced and the syringe will go over the 100 mm3 area in the syringe in a very quick time, and so we will not be able to take correct readings. ...read more.

Conclusion

The only possibility was if the temperature of the acid had changed from when we did the first reading to the finish i.e from when we did the first experiment, the acid hopefully would have been the same temperature. 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 [1]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. ...read more.

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