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Chemistry Coursework Investigation to show how concentration affects the amount of Carbon Dioxide gas produced when Calcium Carbonate Marble Chips react with Hydrochloric Acid at different Concentrations Marbles and limestone are rocks found in the ground. They are both forms of Calcium Carbonate (CaCO�) When Calcium Carbonate is added to dilute Hydrochloric Acid (HCl) a vigorous reaction takes place and fizzing and bubbles can be seen. This happens because a chemical reaction occurs. The equation is shown below... Calcium Carbonate + Hydrochloric Acid --> Calcium Chloride + Water + Carbon Dioxide CaCO3(s) + 2HCl(aq) --> CaCl2(aq) + H2O(l) + CO2(g) In this experiment I will be investigating the rate of chemical reaction between Hydrochloric Acid (HCl) and Calcium Carbonate (CaCO�) marble chips and to investigate how the amount of gas produced changes as the Concentration of Hydrochloric Acid changes when reacting with Calcium Carbonate marble chips. The variable which I will be changing in this experiment is the concentration of the Hydrochloric Acid in Moles and I will be measuring the amount of gas collected when the Hydrochloric Acid reacts with Calcium Carbonate marble chips for a period of two minutes. Prediction My expect that the Higher the concentration of Hydrochloric Acid the greater the volume of gas (CO2) will be given off when they react, this is because in a solution where the concentration is higher the particles are closer and compact which shows that they will collide more often which will result in an increased number of successful collisions and this will cause the amount of Carbon Dioxide gas given off to be increased. ...read more.


Hydrochloric Acid, If any Hydrochloric Acid is made in contact with any part of the body immediately wash that part thoroughly and take other precautions such as wear goggles. Wear rubber gloves and wear safety lab coats and try not to spill chemicals and be careful with apparatus. Diagram Graph Expected Graph Expected Results VOLUME OF GAS COLLECTED AFTER 2 MINUTES (cm�) ACID CONCENTRATION (M) 1 2 3 AVERAGE 2.0 61cm� 35cm� - - 1.5 17cm� 35cm� - - 1.0 22cm� - - - 0.5 0 cm� - - - When we were doing this experiment we decided to alter our method, by only using four different concentrations we thought they would not be enough so we decided to add another concentration of Hydrochloric Acid which is 2.5M. VOLUME OF GAS COLLECTED AFTER 2 MINUTES (cm�) ACID CONCENTRATION (M) 1 2 3 AVERAGE 2.5 42cm� 43cm� 44cm� 43cm� 2.0 20cm� 20cm� 21cm� 20.3cm� 1.5 16cm� 16cm� 16cm� 16cm� 1.0 11cm� 13cm� 9cm� 11cm� 0.5 3cm� 2cm� 2cm� 2.3cm� Analysis/ Conclusion (Graph is On Graph Paper) Looking at my results I feel that the prediction I made before carrying out the investigation was correct. From these experiments we learnt that as the concentration of Hydrochloric Acid increased when reacting with Calcium Carbonate (CaCO�) marble chips the volume of Carbon Dioxide gas given off increased, this is because increasing the concentration of any reactants will increase the frequency of successful collisions and more particles will collide and therefore this will cause the volume of products being formed to be increased and the volume of Carbon Dioxide to be increased. ...read more.


I feel that I have collected enough result to support my conclusion this is because I changed the concentration of Hydrochloric Acid five times and repeated each concentration three times. I think that I have enough evidence to support my conclusion but I could develop my investigation by increasing concentration of Hydrochloric Acid to a higher concentration for example 3M/ 2M. I don't feel that I had any difficulties when I carried out these experiments, I only had slight problems when we had to weigh the marble chips at 0.5g because we had to fiddle with the marble chips to get them to exactly 0.5g because they had to be broken down to get the weight to 0.5g. If I was to make any changes and to repeat the experiment I would change the concentration of Hydrochloric Acid to a higher concentration to make sure that my results would be even more accurate and fair. This would help because we would have a variety of concentrations so we would have a wider range of results to analyse and conclude on. This would make us more certain of our conclusion because we would have a wider range of results and therefore would be able to support our conclusion by the results produced. So overall I am pleased with the results that I achieved and I feel that my prediction that as the concentration of Hydrochloric Acid increases when reacting with Calcium Carbonate Marble chips, the higher the amount of Carbon Dioxide produced and this can be proven by the experiments which I carried out. ?? ?? ?? ?? Zikria Abbas ...read more.

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3 star(s)

This is a fairly good experiment. The author writes in a clear manner, but repeats themselves many, many times and often talks about irrelevant things. The Science is sound and good conclusions are drawn based on the results obtained

Overall, this piece of work is 3 stars out of 5

Marked by teacher Brady Smith 01/12/2012

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