'Finding the Ratio of Mole of Reactants in a Chemical Reaction\r'

'Title: Finding the Ratio of inguen of Reactants in a Chemical reply Purpose of Lab: To get wind the coefficients of deuce chemical substance reactants that appears in a match chemical equation using the incessant variations method. Pre Lab Questions: 1. 2AgNO3(aq) + K2CrO4(aq) > 2KNO3(aq) + Ag2CrO4(s) 2. There is enough to arrive a valid conclusion beca commit, on the graph, one(a) can clearly find that the devil note of hands intersect. Thus, one can also desexualize the inguen dimension. The mole dimension is some 2:1 (AgNO? to K? Cr? ). Procedure: 1.Obtain 175mL of the bleach theme in a wanton 400mL beaker and 175mL of solvent B in another beaker. 2. flier the temperature of both sources and scan. The origins should be the same temperature. If they ar not, you get out need to make a correction for the temperature difference. 3. Using a peachy 10mL graduated cylinder, measure 5. 0m: of NaClO and pour the solution into a Styrofoam cup. Using a clean 50mL graduated cylinder, measure 45. 0mL of Solution B and add this to the Styrofoam cup. 4. Stir with a thermometer, and record the maximum temperature reached of the final solution in your data table. . Pour the solution bring out, rinsing the cup and thermometer, and repeat steps 1-4 using a different symmetry of the dickens substances, always keeping the al-Quran at 50. 0mL. 6. Continue testing various balances until you commit at least three measurements on each side of the one that gave the sterling(prenominal) temperature difference. 7. Plot your data on a graph, ? T ? vs. Reactant people (mL). 8. Draw ii best fit straight by-lines, and determine where they intersect. Be sure to include the points at the 0:50mL and 50:0mL rations. If at whatever points do not fall penny-pinching to the lines, repeat these measurements.Find the stoichiometric mole ration of reactants from the line of intersection on the graph. data: Initial Temp of both: 23. 5? Na2SO3 (mL)| NaClO(mL) | Max. Temp. (? )| 45. 0mL| 5. 0mL| 28. 9? | 5. 0mL| 45. 0mL| 27. 5? | 25. 0mL| 25. 0mL| 42. 3? | 40. 0mL| 10. 0mL| 33. 4? | 10. 0mL| 40. 0mL| 30. 9? | 30. 0mL| 20. 0mL| 43. 5? | 20. 0mL| 30. 0mL| 38. 6? | refinement: In this lab we found the coefficients of two chemical reactants that appe atomic number 18d in a balance chemical equation using the ceaseless variations method. The mole ratio turned out to be 1:1.One can be able to find the correct mole ratio after plotting the results on a graph that showed the trend of change in temperature. Theory: The theory of this investigate was unceasing variation because it gives the stoichiometric ratios for the correct chemical equation if one does them correctly. Error compend: Instead of keeping just one sign temperature for all the tests, to make it more accurate, we could boast measured the initial temperature of the solutions beforehand each reception. The subscribe toness of the thermometer could have change our results. \r\nRelated essay: Measuring reception Rate Using Volume of accelerator Produced LabAlso, there was an error in measure the reactants using graduated cylinders. This most(prenominal)(prenominal) belike happened because graduated cylinders are not the most accurate way to measure a liquid. Post Lab Questions: 1. Different temperature changes pass on when mixing different volumes of the two reactants. The experiment was made so the volume of solution and the total number of moles of reactants was a ceaseless for all of experiments, since temperature change was directly proportionate to the amount of reactants. Therefore, the optimum ratio is the ratio of the volume of reactants.It consumed the greatest amount of reactants, create the greatest amount of products, and generated the most come alive and maximum temperature change 2. A continual volume of reactants must be kept in all campaigns so that the accompanying changes in temperature can be compared. They are pro portional to the amount of reactants consumed in the reaction. 3. Yes. The concentrations of the two solutions must be the same in order for the stoichiometric mole ratio of the reactants to be accurate after the results of the trial are graphed because molar concentration is moles of solute split up by liter of solution. . A change reagent is reactants in a chemical reaction that will be completely kaput(p) before all other reactants in the reaction are employ up. This will also cause the reaction to stop. 5. some(prenominal) measurements limit the clearcutness of the data. The measurement of temperature limits the precision of the data to 3 authoritative figures. The thermometer utilise was able to be read to the tenths of a degree. On the other hand, the measurement of volume limits the precision of the data to 2 significant figures.The graduated cylinders used, only could measure volume to the nearest mL and anything after that was an estimate. 6. The passing r eagent along the upward sloping line of the graph is Na? SO?. The control reagent along the downward slope line is NaClO. 7. Other physical properties that could be used in the method of continuous variation, excessively temperature change, could be color change, the mass of a precipitate that forms, and/or the volume of a gas produced. 8.It is more accurate to use the point of intersection of the two lines to find the mole ratio rather than the ratio associated with the greater temperature change because one most likely did not use the exact mole ratio. Thus, the point of intersection is a more likely an number. Also, the maximum amount of each reactant might not have been used to get the highest temperature; the highest temp wouldnt ineluctably have the highest mole to more ratios. 9. The average of the temperatures would be used as the initial temperature.Graph: Calculations: The intersection point was at approximately 28. 6 mL Na? SO3? and 21. 4 mL NaClO. Moles Na? SO3? = 0. 5 M(. 0286 L) = . 0143 moles Na? SO3? Moles NaClO = 0. 5 M(. 0214 L) = . 0107 moles NaClO .0143 moles Na? SO3? /. 0107 = 1. 34 moles Na? SO3? which rounds to the nearest whole number, 1 . 0107 moles NaClO/. 0107 = 1 mole NaClO The stoichiometric mole ratio is 1:1 for the reactants. The actual stoichiometric mole ratio for the reaction is 1:1.\r\n'