Alka-Seltzer tablets react with water Essay

Things tend to go vilify at higher temperatures because at higher temperatures (60iC+) the dissolved calcium heat content carbonate starts to decompose. This removes the temporary hardness and at that placefore removes the dissolved Ca2+ and Mg2+ ions, therefore subscribe the test unfair because at overturn temperatures there was hardness in the piddle. From the gives obtained it has been seen that the roll of reaction attachs as the temperature increases, supporting my hypothesis in which I stated that As the temperature increases, so will the rate of reaction, tho at higher temperatures the pattern (link) will break down (giving us fallible conclusions and the trend in the graph will show this).Therefore the Alka-Seltzer mesats dropped into the hottest water will dissolve the fastest. As you can see from the graph, at 80i C the link breaks down, giving us a impart that does non accord in with the general trend of results. This is not an anomalous result and there i s a reason behind this. Things tend to go haywire at higher temperatures because at higher temperatures (60i C+) the dissolved calcium henry carbonate starts to decompose. This removes the temporary hardness and therefore removes the dissolved Ca2+ and Mg2+ ions, therefore make the test unfair because at lower temperatures there was hardness in the water.The graph showing the time in seconds (rate of reaction), against the temperature shows the rate of reaction increase with the temperature, and there is a curve that at first goes down steeply, but then becomes straighter. At 80i C the link breaks down, giving us an leftover result, which can be explained by the fact that the Ca2+ and Mg2+ ions are removed payable to the decomposing of the calcium hydrogen carbonate. As you can see from the graph and my table of results, the result obtained at 30i C is an anomalous result (i. e. it doesnt postdate the general trend).This again supports my hypothesis in which I stated this by asseverateing that the link would break down giving us fallible results. The link did not break down at 60i C as I had stated that it would because that is only the temperature at which the Ca2+ and Mg2+ ions started to decompose and once they had in full decomposed the results showed this. For the 1/time(s) against the temperature (i C) graph I got a straight line, which was the line of silk hat belong.Again it shows how unreliable the results are at higher temperatures, as the results for 70i C and 80i C do not fit in.showing how the link breaks down repayable to dissolved substances in the water. This shows that the temperature is inversely proportional to the time. Also I predicted that as the temperature increased by 10i C the rate of reaction would approximately double.The results do not clearly show this fall outing, but I believe that it shows near signs of this happening. At 20i C the average time is 97. 5 seconds. When the temperature was increased to 30i C it appro ximately doubled (x 2. 17 to 3 significant figures) to 45 seconds. however this is an anomalous result and should be higher.Even so, this still supports my prediction. The next result obtained is for 40i C, which is 37 seconds. There is no sign of the rate doubling (x 1. 22 to 3 significant figures), but if we take into account that the previous result should make believe been higher, then it would appear to approximately double. From here onwards it does not double for every 10i C. This is due to my theory (scientific background knowledge) that things go wrong at higher temperatures due to the decomposing of calcium hydrogen carbonate at temperatures of 60i C and above. EvaluationI absorb obtained a reliable site of results, with repeats of the evidence obtained. An accurate procedure was used, with this being shown by the results obtained which all moderate with to distributively one other. By using a burette, it allowed me to work up to a very accurate degree of accuracy, rather than simply using a beaker or a bill cylinder. However, I did use a measuring cylinder for repeat results and this did not seem to affect my results. I obtained genius draw of anomalous results. These were obtained for a temperature of 30i C and did not fit in with the general trend.According to the best-fit line on my graph, the rate of reaction should have been longer and it should have taken about 58 seconds for the Alka-Seltzer tablets to dissolve in water with a temperature of 30i C. A reason for me obtaining this anomalous result could have been due to the fact that whilst the reaction was taking place the 100ml beaker was still in the water bath. This would have caused the temperature to rise slowly and slowly increase the rate while the tablets were dissolving, therefore causing more collisions and increasing the rate.This did not happen however at higher temperatures, because the temperature of the water bath was about the same, and so it did not really have much effect, and it just kept the temperature incessant (i. e. stopped it rising or falling). Although I tried my best to make the experiment perfect there were some unavoidable inaccuracies with the experiment. Firstly, when testing lower temperatures, the temperature of the water bath, which was much higher than the actual temperature being tested, caused a fast increase in the temperature, or if it were lower it would cause it to decrease rapidly, in particular when taken off the Bunsen.These gave us results for inaccurate temperatures to which were we testing. To overcome this problem, a thermostatic water bath would need to have been used, since it can be set to a certain temperature, and it will stop when it reaches there. Also it would mean that the result inside it would reach the exact temperature or close to it. , and not increase or decrease once the water inside it has reached equilibration.Secondly, it was impossible to say when exactly the Alka-Seltzer tablets had compl etely dissolved and consistently decide this for every result obtained. This was a huge flaw in the experiment and affected the results in a big way. To overcome this problem a special raise of apparatus would be need to decide exactly when they had dissolved each time and give us the same measure of consistency each time. To make better the quality of the results, the same piece of apparatus would have needed to be used throughout the whole experiment, and not changed for repeat results.To expire my inquiry and provide additional evidence for this experiment, I think that I could have investigated up to higher temperatures and see how the link would break down, and how the results would fit in with the trend of results. Also, it would have helped me to see how the decomposing of the dissolved substances affected the results. To improve the experiment and make it fair, distilled water should have been used instead of angle water because it is purer than tap water and does not c ontain impurities.