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Find out if the concentration effects the rate of reaction between CaCO3 & HCl.

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Aim factor (1): My aim for this experiment is to find out if the concentration effects the rate of reaction between CaCO3 & HCl. Prediction factor (1): My prediction is that if the concentration of the acid increases there will be an increase in the rate of reaction for example the highest concentration will have the fastest reaction time. I used a preliminary test to help in the prediction. I went and prepared marble chips and concentrated acid we tried the experiment, the results was clear that as in a few seconds it was almost finished. When we used very dilute acid it took so long for it to react and the amount of bubbles were much less than the first one. By using the results I can make the prediction of that, the rate of reaction is affected by concentration. Hypothesis factor (1): If the concentration of an acid increase than the rate of reaction will also increase. When the acid has a high concentration that means in that solution, compared to a dilute one there are more particles available to react with therefore the amount of times they will collide with the each other is more. Introduction: There are many different factors, which effect the rate of reaction. Below is most of the known factors which effect the rate of a reaction: 1. ...read more.


of gas 1st 27 42 55 62 Vol. of gas 2nd 25 45 60 71 Concentration: 6ml acid 4 water Time 15 30 45 60 Vol. of gas 1st 22 40 50 58 Vol. of gas 2nd 21 34 43 57 Concentration: 4ml acid 6 water Time 15 30 45 60 Vol. of gas 1st 10 18 25 31 Vol. of gas 2nd 14 25 32 38 Concentration: 2ml acid 8 water Time 15 30 45 60 Vol. of gas 1st 0 3 5 7 Vol. of gas 2nd 4 7 9 10 Concentration: 0ml acid 10 water Time 15 30 45 60 Vol. of gas 1st Vol. of gas 2nd Did not do experiment would take to long Concentration of acid 2mol Temperature: Constant at Room Temperature Chip size: Constant Powder Chip mass: Constant at 1g Below is the graph for the results: Conclusion factor (1): My conclusion is that the experiment was successful and that the results were reliable to make a conclusion from, we also find that the results were like my prediction and like the preliminary test. I also will conclude that concentration of the acid does effect the rate of reaction. There were a couple of points for the experiment to be improved by, first that by adding the CaCO3 and quickly placing the cork on top will lose time and some of the immediate product is lost. ...read more.


Vol. of gas 1st (cm3) Vol. of gas 2nd(cm3) Average volume of gas 50 71 62 66.5 Temperature: 60�C Temperature (�C) Vol. of gas 1st (cm3) Vol. of gas 2nd(cm3) Average volume of gas 60 74 79 76.5 Concentration: Constant (2 mol/dm3) Surface area of CaCO3: Constant (powder) Below is the graph for the results: Conclusion factor (2): I conclude from the experiment that the temperature will effect the rate of the reaction between HCl and CaCO3. This is because when the temperature was raised the particles will vibrate more making them react faster because the amount of collisions will be higher and faster. There fore I will conclude that the temperature is a factor because looking at the graph we can see that there is a gradient change, which means that there, is a change in the rate of reaction. Also I see that the results were reliable and it was successfully carried out as the results showed that there is a change in the volume of the gas collected. Evaluation factor (2): I must say that the experiment was a fair test but not very accurate. The results could have been more accurate and more reliable if I was able to use the computer and sophisticated equipment to take the results such as a temperature detector. If I was able to use them then I will get much more reliable results and the percentage error will be very insignificant. Overall this was a well-taken experiment with the results needed and the prediction coming out correctly ...read more.

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