Hypo Sodium Thiosulfate Kinetics Lab

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“Hypo” Sodium Thiosulfate Kinetics Lab                                        Ethan Landrum       Period One

Introduction:

        Chemical kinetics, also known as reaction kinetics, is the study of rates of chemical processes. Each reaction, dependent on its reactants, will have differing rate laws in accordance to how fast these reactants are consumed, and thus how fast products are formed. For each rate law there consist only reactants, and their distinctive orders, and a constant. We will not have to worry about the constant for we are not actually determining the rate law of the reaction. The order of the reaction with respect to a reactant of substance in the rate law is determined only upon experimentation. That is what we plan to do here with this experiment: to alter concentrations of hypo sodium thiosulfate, the reactant, to experimentally see changes in rate and determine order. We will do so with knowledge of both differential rate laws and integrated rate laws. Integrated rate laws will reveal to us the order of the reactant by linear trends; integrated rate laws can be manipulated to form equations of lines, and thus can be used to find order, if the plot displays a linear trend.  Our reaction:

        Can be manipulated, rearranged, and balanced to find the net ionic equation of the reaction:

This reveals to us that sodium and chlorine are spectator ions, and the majority of the change of the reaction is done to the sulfur-related ions. This, however, does not alone reveal our rate or rate law. We will determine later on why this isn’t possible.

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Procedure:

Obtain a reservoir of75mL of .17 M sodium thiosulfate. This amount will be enough for all five of your trials. For the hydrochloric acid, do not obtain a reservoir, but rather extract your 2.5mL of HCl for every reaction; measure 2.5 mL HCl, use in trial, then measure 2.5mL again from classroom reservoir/container.

Write a large black ‘X’ in thick marker or pen on a blank sheet of copy paper. You will place your reaction beaker on to this ‘X’ during testing.

 For each trial, measure the amount of sodium thiosulfate needed (shown below) into your ...

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