Determining The Mole Ratios In A Chemical Reaction Lab Report

723 Words2 Pages

Sammi Manis
September 28, 2015
Experiment #04
Determining the Mole Ratios in a Chemical Reaction
CHEM 1315- 012











Purpose:
In this experiment, the experimenter will use two common substances to help determine the mole ratios in the reaction. The two substances are a hypochlorite ion from bleach and a thiosulfate ion used in a solution to develop film.
Using continuous variations, the experimenter will prepare different mixtures using the two reactants that will have the same total volume and total number of moles of reactants. Since the reaction will be exothermic, the mixture with the most heat energy will be the one that fully reacts both the hypochlorite and the thiosulfate ions, determining the enthalpy change. This …show more content…

For example, fireworks are considered an exothermic reaction because they give off energy in the form of heat and light. An endothermic reaction is where the chemicals absorb the light or heat energy from its surroundings. For example, when photosynthesis occurs the plant takes in the light energy from the sun along with carbon dioxide and water to produce sugar and oxygen. The heat taken in would be considered an endothermic reaction.
The limiting reagent (reactant) in a reaction is the substance the controls when a reaction is fully complete. The limiting reactant is fully consumed in the reaction and prevents the reaction from continuing any further. The leftover reactant, or excess reactant, is what is left when the limiting reactant is fully …show more content…

Obtain 200 mL of the sodium thiosulfate solution in a 250 mL beaker, 400 mL of the bleach solution in a 600 mL beaker, and prepare the solutions for the experiment. Using a graduated cylinder, measure 25 mL of the bleach into the beaker very precisely and pour it into a small Styrofoam cup. To help stabilize the cup, rest it inside of a beaker. Next, measure out 25 mL of the thiosulfate solution in a different or clean graduated cylinder.
To prepare the setup for the experiment, put the temperature probe through the hole in a large Styrofoam cup. Fully submerge the end of the Temperature Probe into the Styrofoam cup of the bleach solution. Slide the Styrofoam cup over the top of the smaller Styrofoam cup to cover the small cup. Do not remove the Temperature Probe from the liquid.
Being the data collection by pressing the arrow in the bottom left corner of LabQuest and let it gather some initial temperature readings. Next, lift of the large Styrofoam cup without removing the probe from the liquid. To mix the reactants, swirl the solution cup gently while making sure the probe remains in the solution the whole

Open Document