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Marble chips Dissolved in varied concentrations of HCl.

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Introduction

Marble chips Dissolved in varied concentrations of HCl Planning Before the apparatus was set up the experiment had to planned as fairly as possible. This involved only changing one variable at a time, therefore all the other variables had to be kept constant. Firstly the mass of the chips was kept as similar as possible, I did this by weighing the chips to be at an approximate mass of 5.0g on a top pan balance. From a previous experiment I did involving different sized marble chips I found that the surface area greatly effects the rate of reaction, therefore the marble chips were separated by hand using a sieve to obtain pieces of medium size. Another variable I took into account was the volume of HCl will use, I chose to use exactly 20cm for each experiment. Also I intend to measure the initial temperature of the acid before the experiment with a thermometer. After deciding how to approach all of the variables in the experiment I decided how to carry out my experiment. ...read more.

Middle

I predict that the high molarity concentration solution will have a much faster rate of reaction than the weaker solution. I have predicted this from my knowledge of a previous experiment and scientific knowledge. Recently I did a similar experiment involving magnesium instead of the calcium carbonate, from this I found that the higher concentration solutions, faster the reaction, therefore I believe the same results may occur. I think that this happened because the more HCl in the solution the greater the concentration and there will be more particles colliding and more energy and therefore a faster rate of reaction. The reason I think that the rate of reaction will increase is that the experiment is exothermic, this means that it will give itself more energy and therefore more collisions and faster collisions. Also in the 2.0M solution compared with the 0.5M solution there are much more HCl particles in the same volume so the are going to collide with each other more often (see below) ...read more.

Conclusion

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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