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To see how much carbon dioxide can be measured depending on the size of marble chips used

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PROBLEM A manufacturer wants to start making carbon dioxide on a commercial basis by reacting marble chips with hydrochloric acid. He wants to find out; 1. What factors will affect the rate of this reaction 2. How much carbon dioxide he will obtain when 400 tonnes of calcium carbonate is reacted in an excess of hydrochloric acid. INTRODUCTION/AIM The aim of this investigation is to see how much carbon dioxide can be measured depending on the size of marble chips used. When combined with hydrochloric acid, Carbon dioxide gas is given off, and in this investigation I am measuring rates of reaction. PRELIMINARY INVESTIGATION The rate of reaction depends on how often and how hard the reacting particles collide with each other. Particles have to collide in order to react, and the have to collide hard enough as well. This is called the collision theory. When the temperature is increased the particles all move quicker. If they are moving quicker then they are going to have more collisions. Higher temperature also increases the energy of the collisions, because it makes all the particles move faster. Faster collisions are only caused by increasing the temperature. ...read more.


I will keep the volume of dilute hydrochloric acid the same, and the amount of marble chips the same in the repeat of the experiments. For each experiment, I will use the same amount of Hydrochloric acid, but different sizes of marble chips; large, medium and small. However, the weight of the marble chips must remain the same in all experiments. What will I count, and what will I measure? I will count in minutes each volume of gas given off. I will measure this using a graduated gas labelled syringe. APPARATUS I plan to use the following apparatus: * Conical flask * Stopper * A gas syringe * A stop watch * Marble chips - small, medium, and large * Dilute hydrochloric acid * Measuring cylinder * Electronic balance METHOD When hydrochloric acid is combined with marble chips (calcium carbonate) carbon dioxide is given off. Depending on the size of the marble chips, gas is given off quicker or slower. Marble chips are placed in the flask, and hydrochloric acid is then poured in. A stopper is placed over the flask, and the stopwatch is started. The gas is measured on the syringe every minute, and when it reaches the end of the syringe, the stopper is pulled out so the syringe can be pushed in quickly. ...read more.


EVALUTAION I carried out this experiment as accurate as I could, however it was hard to measure the amount of marble chips exactly each time, and where it should have been 6g of marble chips it turned out to be 6.1g. Also these experiments were carried out over two days, therefore the temperature was different on the two days which could affect the rate of reaction. The syringe was not long enough to measure all the gas and so the stopper had to be pulled up and put back so the syringe could be pushed in. Gas could have been lost here. If I were to do this experiment again I think it would be more accurate because I would be experienced in the operating of it and I would carry it out quicker and therefore in one day. I could carry this investigation further by changing the concentration of acid each time, and see how much volume of gas is given off then. I came across a few anomalous results in my graphs, but most of the time my graphs indicated that the experiments went smoothly and according to plan. From the collision theory (and why rate increases with temperature), it is evident that from my results the reaction between the marble chips and Hydro Chloric Acid is quicker when the marble chips are smaller. ?? ?? ?? ?? ...read more.

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