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Investigating the result of mixing calcium carbonate + hydrochloric acid.

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Chemistry Course Work I will investigate what calcium carbonate + hydrochloric acid will give. To increase the rate of the experiment I could: 1. Add a variety of concentrations of acid (molar). The acids will be concentrated to 3, 2, 1.5, 1, 0.5. 2. I might use a large amount of marble so that there is more surface area and more reaction in the test tube. 3. I might use a catalyst to increase the rate of the reaction. 4. I might grind the marble piece up so that there is more surface area. 5. I might the heat the test tube, where the reaction will be held, so that the particles hit each other more and the reaction is quicker. 6. I might use a stirring rod to increase the rate of the reaction. To increase the rate of reaction the molecules will: 1. They will hit each other more. 2. They will react at a more alarming rate. 3. The acid will corrode the marble chip. 4. I'm going to see how the concentration effects the rate of reaction. Apparatus (1st): Apparatus (2nd): Method: I will set the apparatus out as shown above. ...read more.


CO3 (40 seconds)(1st) CO3 (40 seconds)(2nd) 23 17 19 20 15 17 21 12 10 14 9 11 6 1 13 Results(2nd): Acid(M) Marbles chips used Weight Time for bubbles to stop 3 5 0.38 9min, 7sec 2 5 0.26 8min, 1sec 1.5 5 0.18 10min, 37sec 1 5 0.21 11min, 49sec 0.5 5 0.24 13min, 11sec Graph: From the results I have retrieved I will make two graphs to explain the experiment. I will use two line graphs to do this. (Look at graph paper). Analysis: From the results I have found and the tables that I have drawn I can tell that as the concentration of the acid, in molars, increases there are more frequent appearances of bubbles and the burette fills up with CO3 quicker. For the second experiment I have found that there is a pattern as in the first table all the lines seem to curve in practically the same way. The graph allows me to measure the gradient accurately. From the table I can see that as the acid molecules were more stronger they worked quicker to consume the marble chips that had a quite a bit of surface area. ...read more.


The clock sometimes didn't start when the lever was moved upwards. Each reading that I took was repeated at least twice. From these two readings I made an average conclusion to plot the graph. The only abnormal and uncommon result that I spotted was in the second graph. It was the point where the 3(M) mark was plotted, it was not supposed to be there. The good points about my method were that they were repeated enough times to make an average and hence eliminated any chance of there being a mistake. The bad points about my method were that the marble chips were not always the same weight. The solution of the acid was not measurable so you have to make an estimate the concentration of the acid. As the results were taken on different days the temperature in the room may have varied through the duration of the experiments. I could have used a more effective clock to get better readings. I could have proceeded to use larger amounts or other concentrations of acids. Instead of the experiments that I did I could have done something different for example collecting the gas in a test tube and seeing whether or not it was flammable. Instead of having to repeatedly count the bubbles, which passed through the burette I could have used a laser to count the bubbles. ...read more.

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