lab report: volumeric iron Analysis

User Generated

Wvan01

Science

University of Massachusetts

Description

Abstract (25 pts) Write a detailed abstract for the experiment.  The abstract is a summary paragraph.  You should attempt to write summary sentences for an Introduction section, a Data Section, a Discussion section and a conclusion section.  Then, attempt to put them together in a paragraph in such a way that it all flows together in a well-written paragraph.
 

Data (25 pts)
 

Provide a table that presents the relevant data collected to determine the percent composition.  Include a sample calculation for percent composition.  (20 points)  
 

5 pts will be awarded on your accuracy.  The more accurate the more points you receive.  Make sure to be careful during the experiment.  (5 pts)
 

Questions (25 pts)
 

1. A well-trained technician is expected to perform this titration with a percent relative standard deviation (% RSD) below 0.5 %.  
 

% ??? = (
?? ?
)?100%
 

Where Sv is the standard deviation of the endpoint volumes and V is the average of the three closest endpoint volumes.  Calculate the %RSD and discuss how good your performance was. (10 pts)
 

2. Why is it useful to use an indicator in this titration?  What would be the consequence if an indicator was not used? (5 pts)
 

3. It is mentioned in this manual that the glacial acetic acid (which is just pure acetic acid) and sodium acetate are used as a “buffer” to consume H+ acid which is produced.  Attempt to write the net ionic equation for this reaction.  Hint: one of the two reagents is a product, not a reactant.  (5 pts)
 

4. It is critical that the interactions holding together the Fe-indicator complex are significantly weaker than those holding together the Fe-EDTA-  complex.  What would be the consequence if an indicator was chosen that forms a stronger complex with the Fe3+ than the FeEDTA- complex? (5 pts)
 


Explanation & Answer:
1 Lab Report
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Explanation & Answer

Attached.

1

Running Head: Volumetric Iron Analysis

Volumetric Iron Analysis

Student name:
Institutional affiliation:

2

Volumetric Iron Analysis
Volumetric Iron Analysis
ABSTRACT
The main purpose for performing this experiment is to establish the amount of Iron in
percentage in an unknown salt sample containing ferric ion, Fe(III). The amount of ferric ions
determined through a reaction with EDTA reagent (𝐻2 𝐶10 𝐻12 𝑁2 𝑂8 2− ). A titration process used to
complete the reaction, where EDTA reagent released from a burette until reaction endpoint is
attain. The indicator used in this experiment is salicylate ion, which yields to red wine complex
with Fe(III). The purpose of the indicator is to show the reaction’s endpoint; evident the Fe-EDTA
complex changes to yellow color. During the experiment, the only changes its red wine color upon
addition of sufficient to react Fe(III) sali...


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