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Find out how the changing the concentration of hydrochloric acid will affect decomposition of calcium carbonate.

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Introduction

Marble Chips and HCL Aim: the aim of this practical is to find out how the changing the concentration of hydrochloric acid will affect decomposition of calcium carbonate Prediction : I made some prediction that the more concentrated The acid was the quicker the reaction would Happen and more hydrogen would be produce 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. In a stronger acid there are more acid particles or hydrogen ions to collide at a faster rate this is called collision theory this happens because in a strong acid (2 mol) there are more hydrochloric acid ions these ions the more likely they are to bump into the marble chip but in a weak acid (0.1 mol) there are not as likely to bump into the marble chip basicly a weak acid (1.0 mol)is like walking down a corridor with ...read more.

Middle

in relation to each other, otherwise there 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 five seconds for all of my experiments. Method When doing my experiments I will use the same Process throughout. Once I have set up the apparatus I will measure out 25cm3 of acid in a measuring Tube and then pour it into a Becker .Then I will be ready with the stop watch and then quickly drop in the chips into the acid push on the bung and start the stop watch. This must all be done in a very short space of time. From there, I must take the reading from the volume in the gas syringe every five seconds very accurately until 25 secs is up must record the results in a table and then write it up neat later. ...read more.

Conclusion

This is because I got all the results that I wanted and they look very good. The results were accurate and so I am able to make a good conclusion. From looking at my results I can see that there were no poor results which were a good thing and it proves that everything went very well. Even though the experiments went very well I decided to repeat one concentration of acid 3 times just to see if I could repeat the experiment and get roughly the same results, which is what I did do, and these to go very well. There was no real source of error in the apparatus along as it all was working well and the way it should have been. 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. ...read more.

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