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# How concentration affects the rate of reaction.

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Introduction

How Concentration Affects the Rate of Reaction Aim: The aim of this investigation is to examine the affect of calcium carbonate reacting with hydrochloric acid. My main aim is to find the change in the reaction rate once the concentration of the hydrochloric acid has been increased. Prediction: I predict that the rate of reaction will be greater when the concentration of the hydrochloric acid is 1 mole then it will be when the hydrochloric acid is at 0.6 moles. The greater the concentration the greater the rate of reaction and therefore the more carbon dioxide produced. I predict this because in order for a reaction to take place particle within the solution must collide. The rate of reaction depends on how many successful collisions there are between the two components. In this case if there is a stronger concentration there will be a higher number of particles in the solution and therefore a greater number of particles colliding and a greater chance of them reacting. Explaining the affect: The greater the concentration of a solution the faster the solution will react. ...read more.

Middle

Each test will have to be repeated twice for the same concentration in order for it to remain a fair test. Results: Preliminary: A preliminary test was conducted to help us to come to a conclusion to which would be the best amount of calcium carbonate to use and also which would be the best amount of acid to use in order to insure that they experiment works better. CaCo Acid Time Gas Concentration 5g 30ml 2mins 13ml 0.2m 5g 30ml 2mins 26ml 1m 5g 30ml 2mins 16ml 0.6m 10g 40ml 2mins 5ml 1m 2.5g 30ml 2mins 76ml 1m 2.5g 30ml 2mins 54ml 0.6m 10g 30ml 2mins 41ml 1m The results of my preliminary show made me come to the decision that I would use 5g of calcium carbonate as the results would be easier to use if they were not to high and I would use 30ml of hydrochloric acid as the results that were given were a lot better then the results we received when we changed the acid to 40ml. Main Experiment table 1: CaCo Acid Time Gas Concentration 5g 30ml 2mins 8ml 0.2m 5g 30ml 2mins 12ml 0.4m 5g 30ml 2mins 19ml 0.6m 5g 30ml ...read more.

Conclusion

I believe that my prediction was also correct because as the concentration became stronger the carbon dioxide produced was being given off a lot quicker; the rate of reaction was greater. I feel that the method I used was also a good method as reflected in my results although maybe if we had used a gas syringe the results could have been slightly more accurate. In the experiment I feel that the results gathered were fairly reliable they all increased along with the concentration. The only major problem that I faced was that we had to try and put the bong on the top of the conical flask as quickly as possible as the reactions with the higher concentration were very fast and the gas could have been lost very quickly. If I had to change any factors to improve my experiment further and make it more reliable I would use a gas syringe as the readings would be more accurate and also I would use the same equipment for each test as it may ensure the reliability and make it a more accurate test. Overall I am confident that the experiment was a success and the analysis and results are correct. Hayleigh Cattermole M1 ...read more.

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