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To find the product of sodium hydrogen carbonate when heated.

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Introduction For my chemistry coursework I have been set the task of investigating and producing an answer, for the gas produce of Sodium Hydrogen Carbonate when it has been heated using a crucible and lid, a Bunsen burner and some of the Sodium Hydrogen Carbonate. I will time each separate heating phase and record each mass after a period of time to see how much changes and to see when the mass has stopped producing. So my input variable here will be the Sodium Hydrogen Carbonate (NaHCO3). I will need to consider how many possible equations there are and pick out the ones which I think are most likely to be possible. Questions I should ask myself: What does it become after heating? What will the mass become after heating? What is the final equation for the experiment? What is the gas given off after heating? My prediction is that the mass of the Sodium Hydrogen Carbonate will reduce and therefore aid me in discovering what gas is given off. I think the gas will contain a source of Hydrogen or Carbon. Some predictive equations: * Reactant --> products + gas * NaHCO3 --> NaOH + CO2 * 2NaHCO3 --> NA + H2O + 2CO2 * 2NaHCO3 --> Na2CO3 + H2O + CO2 To discover the mass change I will use different quantities of the product and follow that up with heating. ...read more.


I think this help with my results and the working out needed to discover the final formula. 2. I then began to heat the contents in the crucible and lid, above the Bunsen burner, for 90 seconds each time. I did this until the results table did not seem to be changing. The results stopped changing after 540 seconds. Here are my results for the weighing. Time (secs) Weight of crucible, lid and contents (grams) 90 26.28 g 180 26.26 g 270 26.26 g 360 26.26 g 450 26.26 g 540 26.26 g This table shows that the sodium hydrogen carbonate has reduced in mass by 0.54g. Calculations for final amount left - (26.72 - 26.26 = 0.46g the final sodium hydrogen carbonate, then 1g - 0.46g = 0.54g, the mass reduced). 3. I then took these results and put them into a table to try and discover the formula equation for sodium hydrogen carbonate, when it has been heated. NaHCO3 NaxHyOz Gas Product (carbon dioxide) NaHCO3 = 84 23+1+12+48 =84 v v �84 = 1 gram NaHO = 40 23+1+16 = 38.64* v v �84 0.46 grams CO2 =44 16+16+12 =44 v v �84 = 0.53 grams *this was easier to discover a formula, when I rounded the final atomic mass up to the nearest ten. ...read more.


This also proves that the gas outcome is Carbon Dioxide. Conclusion and Evaluation I thought that if I put our results into a grid that I would see a big difference but I didn't. All I noticed from these is the dramatic drop in the first part of the heating process. Compared to my prediction I am correct. I predicted that the gas outcome would contain carbon or hydrogen and the result was carbon dioxide. I also said that the first initial product (my input variable) would reduce in mass during the heating stage. For this I was correct. Also in my equation predicaments, I had predicted the equation: NAHCO3 --> NaHO + CO2 And this equation was correct. I would take my investigation and extend it further by collecting the gas and testing my results; putting my statement to the challenge! I feel my results were as accurate as they could be and that I managed to sustain a fair experiment. I think that if I was to ensure my measurements were correct then I would use a set of scales with a more definite measurement. I feel this was a very good method to discover the answer to my investigation. Chemistry Coursework Mr. Hillman Vikki Stabler 10J 02/05/2007 - 1 - ...read more.

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