Tuesday, November 26, 2019
An experiment to measure the amount of oxygen bubbles given off in different strengths of sodium hydrogen carbonate Essay Example
An experiment to measure the amount of oxygen bubbles given off in different strengths of sodium hydrogen carbonate Essay Example An experiment to measure the amount of oxygen bubbles given off in different strengths of sodium hydrogen carbonate Essay An experiment to measure the amount of oxygen bubbles given off in different strengths of sodium hydrogen carbonate Essay Equipment list* Lamp* Beaker* Boiling tube* Pond weed* Ruler* scissors* Water* Measuring cylinder* Different strengths of NaHCO3* Paper clip* Stop clockPlanIn the experiment I will get a piece of pond weed and cut it to 5cm I will then make sure that the hole is clear and the leaves from that end have been removed so that oxygen bubbles will be able to escape and not get trapped. Once I have done this I will attach a paper clip to the other end to keep the piece of weed in water or the solution. I will then get a beaker and put 200ml of water and into it. After this I would place the boiling tube with 40ml of water and the pond weed into it and turn on the lamp that will be put 20cm away from the beaker and leave for 3minutes so that the weed can get used to the water.Once these 3 minutes are over I will be taking readings on how many bubbles come out of the weed every 30 seconds and I will be taking ten readings. After I have took all these reading I will do the same again. But inst ead of the piece of pond weed being in water in will now be in 0.25% NaHCO3 and I will do the same leave it for 3 minutes so that the weed can get used to the solution and then I will start taking readings. I will take ten readings one every 30 seconds this will take me up to 5 minutes. After this I will do the same for 0.5%, 0.75% and 1.0% of NaHCO3 during all these experiments I will be using the same piece of pond weed.DiagramPredictionI predict that the more concentration of NaHCO3 I use then the faster the rate of oxygen bubbles that will be given off.Fair TestingIn the experiment I want it to be a fair test so that I can get accurate results so I will be using a measuring cylinder so that I will get the same amount of solution each time. I will be using the same amount of pond weed, as the experiments will run over a number of lessons. I will also want it to be the same temperature so that that will not be able to cause any differences. I will also want the same light intensit y that is why I will be using a ruler to measure the 20cm gapping each time. I will also be leaving it for the same amount of time so that it will all be fair.ResultsA table to show the results from our experimentExperiment one0sec30 sec60 sec90 sec120 sec150 secwater0000110.25%0011220.5%033671011341700.75%0231014170.1%01325293339180 sec210 sec240 sec270 sec300 secAveragewater1133310.25%3345520.5%2032382743073401700.75%1825273343171.0%465156616838Experiment two0sec30 sec60 sec90 sec120 sec150 secwater0234890.25%0681213160.5%002041671080.75%0951802873955031.0%013456180 sec210 sec240 sec270 sec300 secAveragewater111415151590.25%2025313643190.5%2252843403894461750.75%60270781993210405051.0%991112127ConclusionI have come to the conclusion that the higher the concentration of NaHCO3 I use then the faster the rate of oxygen bubbles that will be given off. This is what I said in my prediction.This pattern does not happen when I have had to change my piece of pond weed as the practical ran over a couple of lessons.Looking at my results they back up my prediction as the graph shows the more concentration I use the more oxygen bubbles given off and I am right saying that when I start the experiment in a new lesson the number of bubbles that are given off is less.EvaluationLooking back my method and my results they are pretty accurate. My results are good and I would be happy to use my results to say that the higher the amount of NaHCO3 I use then the faster the rate of oxygen bubbles that will be given off. I can also come to a clear conclusion that when I have had to start with a new piece of pond weed the number of oxygen bubbles has dropped. In my method I could write about why I think that there will be any anomalous results if any.To see if this works in dark we could cut out the lamp so we could do the experiment in dark but it would have to be the same density of darkness otherwise it wouldnt be a fair test.