Pre-lab Report Guidelines for Iron Oxalate Experiment (period 3). This is an individual pre-lab for Colorimetric analysis of Iron

(i) Title
(ii) Reference of procedures
(iii) Introduction
(iv) Procedures (flow chart) (see P. 101 under period 2, Colorimetric analysis of Iron)
(v) MSDS information
The following chemicals will require you to use the MSDS database on the Web (see Lecture Syllabus):

You should record the following MSDS information in your notebook for the chemicals listed above.

(Printouts directly from the Web pages will NOT be accepted!!)

(a) Product Name
(b) Chemical Formula
(c) Formula Weight
(d) Melting Point; Boiling Point and Density
(e) Health Hazard Data (summarize in your own words)
(f) Spill and Disposal procedures (summarize in your own words)

(vi) Prelab study questions (Must show all work for FULL credit)
Complete problems 3 and 4 under period 2 on p.99.

(vii) Data/observations (start a new page for this section)
Set up tables but leave blank. You MUST record all the observations into your lab notebook during your lab sessions.

Post-lab Report Guidelines for Iron Oxalate Experiment (Part 3)

Colorimetric Analysis of Iron

Depending on which task you performed prepare a table for either the titration data or the colorimetric data. Write in your notebook the raw data from the other analyses, so that each person has a full set of data in his or her notebook. Indicate who acquired the data.

(A) Data (see p.103 under Colorimetric Analysis)

Orderly record of data
Data tables should have proper titles/labels

(B) Graph

Beer's Law plot of concentration vs. absorbance for the standard solutions

Your graph must have proper title, labels. Data points must be clearly marked.

Make sure you use the correct type of graph paper. If you use EXCEL, make sure that the gridlines are set properly.

(C) Data Analysis (MUST SHOW ALL WORK FOR FULL CREDIT)

(1) slope of the line (with proper unit)
(indicate which two points on the line you use for calculating the slope).

(2) concentrations for all the standard solutions

(3)from the calculated slope of the line and the absorbance of "solution B", determine the concentration of iron in the "solution B" (with proper unit)

(4)calculate the molecular weight of your product

(5) calculate the moles of iron/gram of product

D) Error Analysis (See lecture guide for details in error analysis)
 

(i) error in concentration for ONE of your standard solution

(all terms identified and error bar placed on graph)

(ii) error in absorbance for ONE of your standard solution

(all terms identified and error bar placed on graph)

(iii) calculate the range of slopes of standard line. You MUST show mathematically how you obtain those slopes (i.e. max. slope and min. slope must be labeled clearly on your graph)

(iv) error in absorbance of your "solution B" unknown

(v) error in concentration of your "solution B" unknown

(E) UV Spectrum Analysis

Using Beer’s law, determine the molar extinction coefficient for the iron complex.