Mole Ratio Write Up

Topics: Chemistry, Chemical reaction, Sodium Pages: 3 (658 words) Published: November 2, 2011
Drew Moyer
Mrs. Haire
IB Chemistry
Experiment 6
Mole Ratio in a Chemical Reaction
Mole ratios of reactants are often times figured out by the use of the other products in a chemical equation. However, in the instance that the products’ mole ratios are unknown, it can be determined through the experiment. This method is called continuous variations. In this lab, I determined the mole ratio between Sodium Hypochlorite and Sodium Thiosulfate by using continuous variations of ratios in a given volume. This reaction was exothermic so I measured the heat that was produced from the reaction. Hypothesis:

The reaction with the proper mole ratio will reach the highest temperature and this is due to the reaction being balanced and theoretically having no limiting reactants. Research Question:
How is the method of continuous variation applied to determine the mole ratio of two separate reactants with unknown products? Aim:
The purpose of this lab is to determine the mole ratio of two reactants in a chemical reaction by using continuous variation. Variables:
Independent Variable: Ratio of reactants
Dependent Variable: Temperature change
Controlled Variable: Total number of moles of reactants

Protective Goggles Thermometer Graduated Cylinder Sodium Hypochlorite (NaClO), solution Calorimeter Sodium thiosulfate (Na2S2O3), solution Distilled Water pipettes Method:

It is important to wear protective goggles and gloves at all time, because these chemicals can cause damage if they come in contact with your skins or eyes. 1. Acquire a beaker that contains NaClO solution and another beaker with Na2S2O3. 2. Measure the temperature of...
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