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An Investigation On How Concentration Of Acid Effects The Rate Of Chemical Reactions

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Introduction

An Investigation On How Concentration Of Acid Effects The Rate Of Chemical Reactions Prediction I Predict that as the concentration of the acid increases so will the rate of chemical reactions. This is because the concentration will increase, so will the number of acid particles which will increase the number of collisions which will increase the number of successful reactions. For example if there is two beakers with 100cm� of hydrochloric acid in each, but with 1M acid in one and 2M acid in the other. The beaker with 2M acid in will have twice as many acid particles, which will mean twice as many collisions, which means there will be twice as many successful chemical reactions, which will resulting a reaction time twice as fast as in the 1M acid. Preliminary Practical Work To make sure that my results in the final practical were accurate and that it was a fair test. I needed to find out how much gas I would need to collect, the volume of acid to put in the conical flask the mass of the marble chips to use and the surface area of the marble chips used. ...read more.

Middle

2. Set up the equipment as above but do not add the marble chips into the acid. 3. Make sure there is 50cm� of acid in the conical flask to make sure you are accurate use a measuring cylinder. For the first experiment use 1M acid. 4. Start the experiment, Drop a marble chip into the conical flask then as soon as the first bubble comes into the measuring cylinder press start on the stopwatch. 5. Keep a keen eye on how the gas fills up in the test tube as soon as it gets to 20cm� of gas press stop on the stop watch. 6. Record your result. 7. Repeat the experiment 2 more times with 1M acid so the results will be accurate and reliable. Use fresh acid every time. 8. Repeat the experiment 3 times with the 2M and 4M acid. 9. Record Your Results. Fair Testing I made sure this test was fair by making sure all of the measurements were the same and the marble chips were the same mass and weight if I had not done this then it could have changed the whole experiment, e.g. ...read more.

Conclusion

The results showed this except they weren't quite as accurate. They were very close at 2M and 4M but were further apart at 0.5M & 1M. I took readings from a best fit graph and the results were quite close to an ideal set of results except for the 0.5M which was too high and had gone wrong for some reason. Acid 0.5 1 2 4 My Readings 368 166 74 39 Ideal Readings 332 148 68 34 Evaluation Most of my results were accurate except for the 0.5M results which seemed to go wrong. All of the other results were quite close together except for a few rogue results which could have been caused by a rise in temperature on the day of the experiment or maybe human error such as the marble chip not weighing enough or it weighing too much. I think to make this experiment more accurate I would have to do all the experiments more times, I certainly would also have to do the 0.5M & 1M tests again if I wanted this experiment to become more accurate. ...read more.

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