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# Investigating The Rate Of Reaction Between Marble Chips And Hydrochloric Acid.

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Introduction

Investigating The Rate Of Reaction Between Marble Chips And Hydrochloric Acid Planning I will use marble chips and different concentrations of hydrochloric acid and water to see how it affects the rate of reaction. I will use concentrations of 50cm3 using different volumes of water and acid. Introduction I am investigating how the rate of reaction between marble chips and hydrochloric acid is altered when the concentration is changed. This is the word equation for my investigation, Calcium + Hydrochloric Calcium + Carbon + Water Carbonate Acid Chloride Dioxide The symbol equation for my investigation is, CaCo3 + 2HCL CaCL2 + CO2 + H2O Prediction I predict that when I have a higher concentration I will have a faster rate of reaction. Referring to Edexcel Science Revision Guide edited by Mary James, the collision theory states that when there are more particles, there are more collisions making the reaction faster (see diagram). Also referring to Chemistry For You by Laurie Ryan, it states "As you increase the concentration of the acid, there are more acid particles in the same volume. Therefore there is a greater chance of acid particles colliding, and reacting with more particles on the surface of the marble." ...read more.

Middle

* A Measuring Cylinder - To measure the amount of gas that is given off. * A Conical Flask - Contains the marble chips, hydrochloric acid and the water that will make the reaction. * A Tube - To connect the conical flask to the measuring cylinder. * A Stand - To hold up the measuring cylinder. Diagram Variables The variables that I shall be changing will be the concentration of hydrochloric acid and water. I shall change them so that added together the make a 50cm3 solution. I shall use the following readings: o 10cm of acid and 40cm of water. (least concentrated) o 20cm of acid and 30cm of water. o 30cm of acid and 20cm of water. o 40cm of acid and 10cm of water. o 50cm of acid and no water. (most concentrated) Controlled Variables I shall keep the mass of marble chips the same (one gram) so that no reading will have an unfair advantage over another. I must also use the same type of marble chips, I shall use big chips. I must make sure I use these for all my readings as if I used powder for one then that reading will have more of a surface area to react upon making the reaction faster. ...read more.

Conclusion

If I was to use pieces, the surface area isn't always the same so even though the mass of the marble chips is the same the surface area will differ, this would affect the results because the bigger the surface area the faster the reaction. If I used powder however, the surface area would be the same increases chances of a fairer test and the reaction would be quicker because the powder has a larger surface area than the chips. Because this would take less time I could also have done more repeats to get a more reliable set of results. The other way I would improve it would be to use a burette instead of a measuring cylinder as this way I can get precise measurements. If I used too much acid the reaction would be faster causing anomalies and making my results less reliable. If I used a burette however, I would have precise measurements increasing the reliability of my results. I have a good range of results and think that I could see what the pattern would be beyond this range. I could develop my investigation in a few ways such as: o See how temperature affects rate of reaction. o See how the use of a catalyst affects the rate of reaction. ...read more.

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