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Investigating the rate of diffusion of ammonia

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Introduction

Investigating the rate of diffusion of hydrochloric acid in agar Planning You can change different things you do to an experiment like the amount of acid, temperature, size of the agar or concentration of the acid. We can measure/observe on how long it takes to diffuse or the amount diffused each minute. My partner and I are going to predict and measure the rough time it will take to diffuse at different temperatures. The factors that may affect the readings of our results are if the temperature of the room may reduce the temperature of our water baths or if the windows open. There may be a human error were the person which is timing may not get it exactly correct or you may not be able to measure the amount of acid correctly. We are going to do the experiment three times and work out the mean time by adding the times together then dividing by however many readings you've added. You have to do them three times just in case the temperature varied. But you should get them roughly around a time. ...read more.

Middle

Just to make sure of the temperature, measure it with a thermometer. When it has reach that temperature get your stopwatch ready and place the 1cm� of acar in the acid. While its starting off write all the temperatures you will do on a results table. The diffusion should make its way into the centre of the cube. When all the purpleness has gone competely stop the stopwatch and record the time on your table. Then repeat that procedure two more times for that temperature then for all the rest. We are doing four temperatures to make sure our prediction is correct, we are taking the measurements: 0, 20, 60 and 70 degreese. We don't need to take preliminary work before because we are doing freezing point, room temperature, 60, 70 and maybe 100 degrees to make a kind of a range of temperatures. When we do the experiment we are wearing our school uniform so we are tucking our ties in and taking are blazers off. To pretect our eyes we are wearing safety goggles and using spatulars to pick up the agar because its an alkali and it can damage your eyes and it wouldn't do any favours to our bodies. ...read more.

Conclusion

That may of faulted our results was doing them at the same time with one stop watch. It could have been good because that would of meant they were at the same temperature instead of different varying temperatures. If you did them separately they would of varied at different rates. When we repeated the ice one there was a five minute gape between the 1st and the 2nd and 3rd. Between 20 and 60 is a wide gape so if we do it again then do it every 10th or 20th of a 100. There may have been a to narrow gape between 60 and 70 compared to 0 and 20. We can and cannot use our results because they are correct in terms of our prediction and we cannot uses them because they aren't completely correct. We could make the investigation better is if all the temperatures could stay constant and have more time to do more varied temperatures to completely back up my conclusion. May be to get more evidence then do the concentration of the acid and the amount of acid to see which one has the most effect on the agar. By Katie Blewett ...read more.

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