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Surface Area and Rates of Reaction Between Mable Chips and Hydrochloric Acid

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SURFACE AREA AND RATES OF REACTION BETWEEN MABLE CHIPS AND HYDROCHLORIC ACID Aim In this experiment I have the choice to change the concentration of the hydrochloric acid or the size of marble chips. I have chosen to change the size of marble chips to investigate the rate at which the reaction will take place and to determine the size of marble chips that liberate the most and the least carbon dioxide gas. The word equation for the reaction between marble chips (also known as calcium carbonate chips) and hydrochloric acid Calcium carbonate + hydrochloric acid calcium chloride + water +carbon dioxide The chemical equation for the reaction between marble chips (also known as calcium carbonate chips) and hydrochloric acid CaCO3(s) + 2HCl(aq) CaCl2 (aq) + H20 (l) + CO2 (g) Fair test In order to keep a fair test, only the surface area (i.e. size) of the marbled chips is variable. Other variables are to be kept constant to avoid obtaining wrong results. These other variables include: *Temperature: -temperature of the reactants are kept at room temperature. *Volume of acid: - the volume of acid is kept constant at 25cm3 *Concentration of acid: - the concentration of acid is kept constant at 1Mol/dm3. *Mass of chips: - the mass of chips use is fixed at 25g. *Surface area of the conical flask: - the size of the conical flask is kept constant. The HCl cannot be used again after the reaction because the acid becomes less strong to react with the acid. ...read more.


The acid was added to the calcium chloride and the gas produced was measured every 30 seconds. Method First of all I am going to test the reactivity of small marble chips. I measured 25g of calcium carbonate and added them into the conical flask. I measured 25cm3 of hydrochloric acid and put it in the gas generator. I put the cork on the gas generator as fast as I can could and started the stopwatch immediately. After every 10seconds, I record volume of gas in the measuring cylinder. After 3 minutes I took the last reading. After each time I will throw away the marble chips because they cannot be used again as some reactants have been used up. To get the best result I am going to test it two separate times for each size of particles to be able to calculate an average to reduce errors in my work. Diagram of the experiment My Result *Large marble chips TIME TAKEN 30 60 90 120 150 180 210 240 270 300 330 360 Try 1 10 25 40 55 66 78 88 94 100 108 112 120 Try 2 Average *Small marble chips TIME TAKEN 30 60 90 120 150 180 210 240 270 300 330 360 Try 1 18 46 70 88 108 122 134 144 156 160 168 174 Try 2 Average *Powdered chips TIME TAKEN 5 10 15 20 25 30 35 40 45 50 55 60 Try 1 102 112 114 116 118 124 128 132 134 134 136 138 Try 2 ...read more.


Also at the beginning of each experiments, I had to pour the acid in the gas generator and put a cork on the gas generator. As soon as the acid is poured into the gas generator, the reaction begins and some gas might have been lost. The size of the large and small chips were not exactly the same, each group was made up of chips of approximately equal sizes and this is not exactly accurate. In stirring the experiment one had to be careful of stirring it evenly and not aggravating the reaction. The experiment could have been improved in various ways. Using beads of limestone can solve the problem of unequal size of particles. Using a magnetic stirrer can be used solve the problem of uneven stirring of reactants. Using a syringe inserted through the cork to add acid to the chips solves the problem of losing gas at the beginning of the experiment. The use of a more accurate scale helps in solving the problem of reading off measurements from the measuring cylinder. Drawing the curves of best fit was an accurate step I took. My graphs helped in proving my aim, though I got some recurrence in the amount of gas produced during the experiment. A distinctive trend is shown in the graph as clearly show that small particles react faster than large particles. I was interested in this experiment when I first started. I was interested in seeing changes in the reactants at the end of the reaction. I was very satisfied when I found out that my predictions were correct. ...read more.

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