Examb - CHEM 209 Final Exam 1 00/06 NAME 1(16 POINTS What...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Background image of page 1

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

View Full DocumentRight Arrow Icon
Background image of page 2
Background image of page 3
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: CHEM 209 Final Exam 1 00/06 NAME: 1. (16 POINTS) What quantifies axe plotted on the x- and y-axes of: x-axis -axis (a) an absorption spectrum? (b) a chromatogram? 2. (8 POINTS) Define the term “retention time”. What is its principal use in GC analysis? '3. (12 POINTS) Write the equilibrium constant expressions for the following balanced chemical reactions: (a) 1131904 + 311120 ——> P044 + 31430+ K = (b) Agzso‘. (solid) ——> my + sofi K = (c) 2 mo; + 3 czofi' + 4 OH" ——'—> 2 M1102 (solid) + 6003’“ + 2 H20 K = .-~m———m—_nlp—mmmmm¢mht—w_—-——-——u------- . . 7_-——.——w-w-%——-——— 4. (24 POINTS) Suppose that you are 'ven the task of determining the SCN' content ofa- blood sample by forming the Fe(SCN) + complex and measuring its absorbance.’ You _ begin by taking a 10.00-mL portion of the blood sample, centrifil ' g it, transferring 0.25 ml ofthe clear serum to a flask, and adding 5.00 .ml of 0.20M Fe . The %T ofthis solution, measured at 450 nm, is 51.5%. A calibration curve, prepared from I"e(SCN)2+ standards, indicates that the Fe(SCN)2+ concentration of the diluted sample solution is 0.064 111M. (a) Calculate the SCN' content (in mM) of the blood sample. SHOW ALL WORK CLEARLY. (Atomic weight of Fe = 55.85 gram/mole; formula weight of SCN' m 58.08 gram/mole) (b) What is the absorbance of the diluted sample solution? 5. (24 POINTS) Draw block diagrams of each of the following analytical instruments, labeling all the important components. (a) a gas chromatograph (GC) (b) a visible spectrophotometer (e.g., the Spectronic 20) 6. (16 POINTS) Sketch the shape of the titration curves expected for the following tinntions: (a) HC] with NaOH _ PH mLNaOH : (b) Na2CO3 with HCI . pH le-ICl j (c) NaOH wjth HC] pH mL HCl (d) KHP with NaOH pH mL NaOl-l ‘fimmmmW—Mimmmfirm,_-___.____.._..._.__... .. ...
View Full Document

Page1 / 3

Examb - CHEM 209 Final Exam 1 00/06 NAME 1(16 POINTS What...

This preview shows document pages 1 - 3. Sign up to view the full document.

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