Experiment 5 Essay

Submitted By StephieConnell
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1. Explain how this method allows you to find the mole ratio of reactants. Mixing different volumes of the two reactants resulted in different temperature changes. The temperature change was directly proportional to the quantity of reactants consumed because the experiment was designed so that the volume of solution and the total number of moles of reactants was a constant for the series of experiments. Thus, the optimum ratio(determined after the results of the trials are graphed) is the ratio of the volume of reactants that consumed the greatest amount of reactants, formed the greatest amount of products, and generated the most heat and maximum temperature change.

2. 2)Why must you keep a constant volume of reactants? A constant volume of reactants must be kept so that the resulting changes in temperature can be directly compared because they are directly proportional to the quantity of reactants consumed in the reaction.

3. 3)Is it necessary that the concentrations of the two solutions be the same? Yes; in order to for the stoichiometric mole ratio of the reactants to be accurate after the results of the trial are graphed, the concentrations of the two solutions must be the same. This is because molar concentration is moles of solute divided by liter of solution.

4. 4)What is meant by the term limiting reagent? A substance described as a limiting reagent is a reactant in a chemical reaction that will be completely reacted before all other reactants in the reaction are used up, causing the reaction to stop.

5. 5)Does the measurement of temperature or the measurement of volume limit the precision of your data? Explain. The measurement of temperature limits the precision of the data to 3significant figures, and the thermometer used was capable of measuring temperature to the tenths of a degree. The measurement of volume limits the precision of the data to 2 significant figures because the graduated cylinders used were only capable of measuring volume to the nearest mL

6. 6)Which reactant is the limited reagent along the upward and downward sloping lines of your graph?
Na2S2O3and NaCLO, respectively

7. 7)What physical
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