The aim of this experiment is discover the relationship between the temperature (20C,25C,30C,35C,40C) of the reaction between acidified Potassium Dichromate and Iron using a water bath

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Thomas Bishop        13EVF        3/07/11

Chemistry Write up # 9:       Design          

Design - Potassium Dichromate

Introduction:

The reaction that is carried out in this design practical is between acidified Potassium dichromate and Iron wool. The reaction is a redox reaction. A Redox reaction (a short way of saying “reduction-oxidation reaction”) is the simultaneous transfer of electrons between multiple substances. The oxidation numbers or the oxidation state of atoms is changed through the process of oxidation or reduction. Reduction is where electrons are gained to the reaction and oxidation is when electrons are lost in a reaction between substances.

In this experiment Iron (or Fe) is losing two electrons meaning it undergoing oxidation. Potassium Dichromate is gaining electrons meaning it is undergoing reduction. The Iron is the Reducing agent because it gave electrons to the Potassium Dichromate. The Potassium Dichromate is the oxidising agent because it took electrons from the iron.

This experiment will attempt to prove the redox reaction through experimentation.

Redox half equations:

x3 ( Fe       →       Fe2+    +   2e- )

Cr2072-     +     14H+   +     6e-     →    2Cr3+       +    7H2O

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Cr2072-     +    14H+    +     3 Fe       →    2Cr3+    7H2O   3Fe2+

Aim: 

The aim of this experiment is discover the relationship between the temperature (20°C,25°C,30°C,35°C,40°C) of the reaction between acidified Potassium Dichromate and Iron using a water bath on the rate in which the acidified Potassium Dichromate and Iron react and change colour from yellow to dark purple.

The independent variable in this experiment is the temperature. The reaction will be carried out at a range of temperatures. (20°C,25°C,30°C,35°C,40°C) . The reaction will be carried out in a water ...

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