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The diffusion of Ammonia Gas

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Daniel West 10AR Coursework: The diffusion of Ammonia Gas Introduction Diffusion is the way gases spread out to occupy all the space available to them, this is because they move from a concentrated area of the gas to a less concentrated area of the gas. As I have done this experiment in a previous lesson I will use my results from the previous lesson as a source of information, comparing those results with the results I get this time. Factors that may affect the diffusion of ammonia gas The factors that may affect the outcome of the diffusion are the temperature as it may produced more gas and the heat energy will increase the speed at which the gas particles are moving. The diameter of the tube because the gas has more space in the tube, the wider it gets and less to fill if it is smaller. The concentration of the solution is also a factor as a higher concentration may give off more gas than a solution with a lower concentration. ...read more.


Diagram Method Set-up the apparatus as shown in the diagram. Wet out five pieces of litmus paper and put them inside of the tube 4 cm apart. Put a bung on one end of the tube and on the other bung. Pin some cotton wool with 3 cm3 of ammonia solution on it with a drawing pin. Put this bung in the other end of the glass tube and start the timer. Record the time after each piece of litmus paper starts to go blue; this is to make sure that the time is measured fairly. Wash everything out and set up the apparatus as before, so that the test is fair. Also to make sure it is fair use the same tube, the same size litmus paper and cotton wool, and the same amount of ammonia solution on the cotton wool. Repeat this each time changing the angle at which the tube is positioned. Starting at 0� (The cotton wool at the top of the tube), change the angle by 30� each time, all the way round to 180� (The cotton wool at the bottom of the tube), recording all of your results. ...read more.


The energy of the gas comes from the amount of solution and concentration of the solution as the more solution of a higher concentration the more energy there will be. Evaluation I think that the experiment was accurate enough to obtain sufficient results to be successful. Although I do have some, anomalous this may be the temperature on the day, as I did not have time to do all of the experiments in the same day or not being able to recognise when they turn blue. I think that there is enough evidence to support my conclusion because I have 35 results (5 for each distance) and accurate enough distances amounts. To improve the reliability of the experiment I could try to use the same size cotton wool every time. I could also use more litmus paper to get more results. To extend this experiment I could try doing the same thing with a lower concentration or with less distance between the litmus paper. This can provide additional evidence because I can compare these results with the ones that I have now. ...read more.

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