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# Does Doubling the Strength of Ammonia Double the Rate of Its Diffusion?

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Introduction

BIOLOGY SC1 ASSESSMENT DOES DOUBLING THE STRENGTH OF AMMONIA DOUBLE THE RATE OF ITS DIFFUSION? PLANNING In this investigation I am trying to find out if doubling the strength of ammonia doubles the rate of its diffusion. There are a few factors that may have an effect on the results of this investigation. For example, the size of the test tube, the distances between each piece of litmus paper and the amount of ammonia on the wool. The longer or wider the test tube the more time it will take for the ammonia molecules to diffuse along the tube which would increase the time on the results table. A similar principle would apply to the distance between litmus papers. The ammonia is most likely to reach the litmus paper closest to it first and then to the second as it will take more time for the ammonia molecules to diffuse across the tube. Also each time the ammonia is applied to the wool it must be the same amount for every test carried out, otherwise the test would be unfair. ...read more.

Middle

I will take 1 reading every time a litmus paper changes colour, which will result in 7 readings for every test. Then I will obtain the results taken by two other people in my team and average them out by adding the results up and dividing by 3. This will give me a reliable answer as to how long it took for each of the seven litmus papers to turn from red to blue. So the number of tests to be performed in total is 3 and so by multiplying 3 with 7 will equal 21 results being taken from 21 litmus papers changing colour. These results will be taken in seconds but I shall convert any that are given in minutes by the stopwatch, into seconds. OBTAINING EVIDENCE The table below show my results: The Concentration Of Ammonia Litmus paper no 0.5% 1% 2% 4% 1 8 sec 13 sec 15 sec Average = 12 3 11 3 Average = 6 1.5 6 2 Average = 3 0.5 3 2 Average = 2 2 30 1.00 = 60 sec 1.04 = 64 sec Average = 51 32 31 20 Average = 28 15 ...read more.

Conclusion

The pattern shows that as you double the concentration of ammonia, the quicker it takes to change colour from red to blue. This is because, as I had predicted, increasing the concentration also increases the number of molecules, which collide more. Consequently, the ammonia molecules spread out to make greater space to move around more quickly and easily. EVALUATING The experiment appears to have been successful as I acted according to my plans and achieved the results I had expected. My results could be improved by carrying out the tests a few more times, in order to achieve more accurate results. I can conclude from my results that doubling the strength of ammonia doubles the rate of its diffusion. A pattern in my results also showed that a as you double the concentration of ammonia, the average time is twice as less. However, this pattern was not apparent when I increased the concentration of ammonia from 0.5% to 1%. On that occasion it seems that the time had reduced by more than just a half. The reduction in time was usually approximately by half, but by drawing a line of best fit through my graph, it can be said that doubling the concentration of ammonia does double the rate of diffusion. ...read more.

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