chemlab2 - UW Chem 152. Lab 2

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Name:Christina Hong 0862620 Section: AR Lab Partner: Travis Huynh Total Points = 60 pts (5 pts notebook, 55 pts template) DATA, GRAPHS AND CALCULATIONS 1 pt Creating the calibration curve: Ferroin: Concentration (M) Absorbance 1.25E-05 0.170 2.50E-05 0.320 2 pts 3.75E-05 0.470 5.00E-05 0.630 6.25E-05 0.730 Purpose and Method Clearly state the purpose of this part of the lab. Explain how this is accomplished in this experiment. What calculations do you need to perform? What measurements will be made? [Do not provide experimental details here]. How do you go from calculated/measured values to accomplishing stated purpose? ( 10 pts ) The first objective of this lab is to learn how to prepare standard solutions from a stock solution. The second objective of this lab is to use these standard solutions to obtain a calibration curve in order to determine the concentration of an unknown solution. In general, there are three parts to this lab: 1) Preparing Five Standard Solutions 2) Preparation of the Iron Sample 3) Determination of Iron in an Iron Tablet In part I of this lab, I will be preparing five standard solutions of various concentrations (calculated from the pre-lab) with a digital pipetor. Then, I will be diluting each of the different stock solutions with deionized water to the calibration mark. After diluting all five of my standard solutions, I will then prepare my own ferroin complex, which is done in part II of the experiment. In preparation of my own ferroin complex, I will have to weight and transfer about 100mg of the iron tablet powder into a 100mL beaker. Then, I will have to make sure that all of the iron (II) ends up in the flask. After I draw 1mL of this solution into another flask, I will be adding hydroxlyamine hydrochloride, sodium acetate solution, and 1,10 phenanthroline to the solution in order to have the ferroin complex. In part III of the experiment, I will be using spectral analysis to evaluate the amount of light each of the ferroin solution absorbs, including the one I prepared in part II. The data I collect from the spectral analysis will be used to create a graph and calculate a calibration equation on Excel. From this calibration equation, I will be able to calculate the concentration of ferroin in my solution from part II. The calibration equation I will be using is Absorbance=slopex[Ferrion]+y-intercept.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 04/13/2010 for the course CHEM 152 taught by Professor Chiu during the Winter '08 term at University of Washington.

Page1 / 3

chemlab2 - UW Chem 152. Lab 2

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online