Experiment: Redox Titration and Determination of Percent
Iron (Fe)
Daniela Garcia
Meghan Hass and Lucero Villanueva
CHEM 1300
Dr. Lisa Baptiste
Lab Assistant: Spandana Atluri
October 27 2016
Abstract:
The purpos
...
Experiment: Redox Titration and Determination of Percent
Iron (Fe)
Daniela Garcia
Meghan Hass and Lucero Villanueva
CHEM 1300
Dr. Lisa Baptiste
Lab Assistant: Spandana Atluri
October 27 2016
Abstract:
The purpose of this experiment was to be able to understand and perform the
standardization of Potassium Permanganate (KMnO4) in order to therefore determine the percent
of iron within the sample. In the first part of this experiment, the standardization of Potassium
Permanganate was desired and achieved through a titration process. After standardizing the
KMnO4, the average molarity was 2.798 x 10-5. Knowing the average molarity, the second part of
the experiment dealt with determining the percent of iron (Fe) within the unknown sample. This
unknown sample was titrated with the standardized potassium permanganate. Once completed,
the average percent of Iron within the sample was 7.6%. Using the titration techniques, we were
able to find both the standardized potassium permanganate and determine the percent of Iron
(Fe) in an unknown sample.Objective:
In the first part of this experiment, the objectives is to use previously learned titration
techniques to standardize a given sample, Potassium Permangate. Once it is standardized, the
second part of this experiment is to be able to determine the percent iron from an unknown
sample.
Introduction:
Redox describes all chemical reactions to which their atoms have a changed oxidation
number. These reactions often produce a drastic change in the physical properties of the
chemicals involved, which is why these elements are suitable for titration experiments. Reactions
which involve elements that transfer electrons to one another are known as reduction – oxidation
reactions (redox). During these reactions, electrons are exchanged between reactants to which, its
resulting designation of products depending solely on the gain or loss of electrons during that
reaction. Speaking about the product side, the products of a redox reaction in which electrons
have been gained are said to have been reduced. On the contrary, products of a redox reaction in
which the electrons have been loss are said to have been oxidized. Similarly, the reactant that has
lost elections during the reaction is known to be the reducing agent, while the reactant that gains
electrons is known to be the oxidizing agent. Due to the law of conservation, the number of
electrons that a product gains must be the same as the number of electrons that have been lost by
the reactant. To give an example of this, we can take a look at the reaction that occurs between
potassium permanganate and an iron salt.
MnO4 -1 + 8H+ + 5e- Mn2+ + 4H2ODuring the reaction, we are able to see that the reactant has gained electrons, making it reduced
and the product side oxidized. To determine which element is experiencing either oxidation or
reduction, it can observe by their changes in oxidation state before and after.
The titration technique that were used in this experiment is different compared to the
titration technique used to find the percent of an element. To find the molarity of the iron in the
sample, the molarity of KMnO4 is needed. To do this, sodium oxalate was added to it to make it
standardized.
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