Limiting Reactant Lab

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The Relationship between Reactants and Products
Introduction
In a chemical reaction, the amount of starting material for a chemical reaction limits the amount of product that can be formed.1 The principle of limiting reactants relates to this lab because the limiting reactant is the substance that is used up first in a chemical reaction. The amount of product was limited by that reagent. The excess reactants were considered to be the other reagents that were presented in excess of the quantity that was reacted with the limiting reagent. The theoretical yield was determined as the amount of product obtained when the limiting reagent was completely used. The limiting reagent was identified in order to calculate the percent yield of the reaction.
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25 mL of sodium iodate solution was added to each flask. Using 10 mL and 25 mL graduated cylinders, the following volumes of CaCl2 solution with a concentration of 22 g/L was added to the Erlenmeyer flasks. In flask 1, 5 mL of CaCl2 solution was added. In flask 2, 15 mL of CaCl2 solution was added. In flask 3, 25 mL of CaCl2 solution was added. In flask 4, 35mL of CaCl2 solution was added. In flask 5, 40mL of CaCl2 was added. The mixture was stirred into each flask. The observations about the reaction in each flask was recorded in the Results and Analysis section. The filtration process was the same for each product. First, the suction filtration apparatus was set up. Using a Buchner funnel, the funnel was fit in a filter flask, which is an Erlenmeyer flask with a second opening off the side of its neck. The second opening was attached to an aspirator, which provided the vacuum. A circular piece of filter paper was placed over the holes in the bottom of the Buchner funnel. A heavy rubber tube was connected to the side arm opening on the filter flask. Then, the tube was attached to a special side opening on a water …show more content…
A piece of filter paper was placed on the funnel and moistened with distilled water. With the aspirator on, the contents of flask 1 was poured into the funnel. The flask was rinsed out with distilled water and poured into the funnel in order to get most of the salts out of the funnel. The aspirator sucked the filtrate through the filter funnel. Once most of the liquid has been removed from the filter funnel, but the solid was still wet, 10 Ml of ethanol was added to the solid in the filter funnel. The ethanol was sucked through the filter funnel. The aspirator continuously ran in order to dry the solid on the filter funnel. Five vials were obtained and labeled with name, reaction number, and the flask number. The empty vials were weighed and their mass was recorded. When the solid was dry enough to remove from the filter funnel, the aspirator was turned off and the filter paper was removed from the suction flask. A spatula was used to gently remove the solid from the filter paper and placed into the corresponding vial. This process was repeated for all five Erlenmeyer flasks. Once completed, the vials with the solid contents were massed. After a week of drying, the vials were obtained and massed again. A graph using Excel was

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