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My aim is to investigate the effect of concentration on the rate of reaction.

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Introduction

Chemistry coursework Planning Aim: My aim is to investigate the effect of concentration on the rate of reaction. Introduction: To investigate how concentration affects the rate of reaction we will be reacting calcium carbonate and hydrochloric acid. The products of the reaction between calcium carbonate and hydrochloric acid are calcium chloride and carbon dioxide. To measure the rate of reaction we will be measuring the volume of carbon dioxide produced. The size of the marble chips available will be small, large, and medium. The highest concentration available in the experiment is two molars. The equation for rate of reaction is: Calcium carbonate + hydrochloric acid ? calcium chloride + water + carbon dioxide CaCO? (s) + 2hCL ? CaCL2 + H?O (l) + CO? The collision theory explains why certain factors affect the speed of the reaction. Particles often collide more often in a certain time, so reactions speed up. The collisions are harder with higher temperatures, concentration, and larger surface areas. There are a few general factors, which affect the rate of any reaction: 1) Concentration: The collision theory states that before we can get a chemical reaction, particles must crash together. ...read more.

Middle

This increases the rate of reaction because the concentration is increased. The rate of reaction begins very rapidly but gradually decreases because the number of molecules present will decrease as they react, because the concentration of the solution decreases. This makes a curve in the graph as the reaction slows down. The increase in concentration should be directly proportional to the increase of the rate of reaction at a given time. Fair test: To make this a fair test we will have to keep all variables the same except the one we area investigating. We will also have to make sure that we carry out the same method more than once to confirm that we get reliable results. To make this experiment an even more reliable and accurate test, I will control the factors that affect the rate of reaction. I will only change one factor at a time or I will not know which factor is affecting the rate. I will keep the rest of factors the same. The things I will change............................................ Safety: To ensure that the experiment is safe, I will: ? Wear safety goggles. ? ...read more.

Conclusion

Loss in mass is 0.28g in the 1m solution, but it is 0.61g in the 2m solution. In addition, loss in mass is 0.33g in the 1m solution, but it is 0.70g in the 2m solution. Therefore, as you can see, the weight is almost doubled, every minute. Throughout the whole experiments, I see that the reaction is always fastest at the start, then slows down in the middle of the experiment, and finally ceases at the end. This conclusion supports my prediction because at the start of the experiment, I predicted that the higher the concentration, the faster the rate of reaction would be, because the higher the concentration of the solution, the more molecules there are. This means that there will be a higher chance of the molecules colliding with each other and I higher chance of them reaction. This increases the rate of reaction because the concentration is increased. The rate of reaction begins very rapidly but gradually decreases because the number of molecules present will decrease as they react, because the concentration of the solution decreases. This makes a curve in the graph as the reaction slows down. The increase in concentration should be directly proportional to the increase of the rate of reaction at a given time. I understand that my prediction was correct. Sonya Shannon Uddin ...read more.

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