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# Rates of Reaction - Marble Chips and Hydrochloric Acid.

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Introduction

Marble Chips / Hydrochloric Acid Rates of Reaction: Marble Chips and Hydrochloric Acid Rates of Reaction PLANNING AIM To find if changing the concentration of an acid will increase or decrease the rate of the reaction when marble is dissolved in hydrochloric acid. PREDICTION When the concentration of acid increases, more gas will be given off faster. I know this from my trial experiments. METHOD Since I will be working with strong acid, I will wear safety goggles while conducting the experiment. I will use Marble chips all of a small size. I can use a sieve to make sure they are all roughly similar size- about 7mm diameter. The amount of acid I have decided on is 10ml. ...read more.

Middle

I learnt from the trial experiments that it is quite hard to start a stopwatch, pour acid and stick a bung into a boiling tube all at the same time, so I will get someone to assist me while doing so. If the experiment goes on for a ridiculous time, I will cut it off. I don't think it is necessary to have the experiment go over three minutes, so I will cut it off then. Also, if the amount of gas goes off the scale I will stop it there. It is important to keep the starting temperatures constant for all the reactions as this can affect the results by giving the particles more energy (and making it faster). ...read more.

Conclusion

(I can draw this from my initial hypothesis) OBTAINING EVIDENCE TABLE of RESULTS Concentration of Acid. Time 10 20 30 40 50 60 70 80 0.5 15 20 25 28 30 32 34 36 37 38 0.5 14 22 28 33 38 41 44 47 48 50 1 28 48 58 67 79 83 93 97 100 105 1 20 40 54 64 73 81 86 92 99 103 2 40 60 76 90 100 2 38 55 74 89 100 3 30 44 70 85 99 110 3 30 62 90 110 4 7 115 4 30 65 87 110 During the experiment, I kept the starting temperature constant at 23 degrees. I stop watch to time the experiment. I wore safety glasses. Time is in seconds. Concentration is in morality.. I repeated the experiment twice to make sure my results were reliable. ...read more.

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