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Lab Report On Rates Of Chemical Reaction

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Lab Report Experiment 6 Rates of Chemical Reactions

By Nikhola Mirashirova
Lab Partner: Dina Abetova
Section 3, Saturday

October 31, 2015

Introduction Rate reaction is the measure of the change in concentration of the reactants or the change in concentration of the products per unit time.1,2 Rate law for this experiment:

Rate = k(I-)m(BrO3-)n(H+)p

There are several factors which affect the rate of reaction: catalyst, reactant concentration, and temperature.1,2

A catalyst is a substance that changes, increases or decreases, the rate of a chemical reaction but is not being used up during the reaction.3 It provides an alternative way, so that the rate of reaction changes.4 Catalyst, which is used in this experiment, is (NH4)2MoO (0.5 M).

In this experiment rate of reaction with different reactants concentration: KI (0.010 M), KBrO3 (0.040 M), and HCl (0.10 M) will be observed. So, this is reaction between iodide and bromate ion under acidic conditions:
6 I- (aq) +BrO3-(aq)+ H+(aq)→ 3I2(aq) + Br-(aq)+ 3H2O

The end of the reaction, will be determined by observing color change of solution. Thus, solution should shange color to blue. Blue color appear because of starch indicator. Starch indicator reveals the blue color due to the presence of I2. During the reaction iodine reacts with thiosulfate at the beginning:

I2(aq)+2 S2O32-(aq)→2 I-(aq) + S4O62-(aq) After thiosulfate is gone from the system iodine concentration increase giving
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