AssignmentOneKey - Take Home Assignment #1 Key Please turn...

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Take Home Assignment #1 Key Please turn in neatly worked solutions for the following problems. Answers are due by 4:00 PM on Friday, August 31 st . 1. Erythrosin B (which we will abbreviate as EB) is a dye with many analytical uses, including a biological stain for bacteria in soil, a plasma stain for nerve cells (when used in conjunction with the dye methylene blue), a phosphorescent probe for studying the diffusion of membrane proteins, and as an acid-base indicator. The chemical formula for the sodium salt of EB is C 20 H 6 O 5 I 5 Na 2 . Suppose you take a 0.2519-g sample of a 0.116% w/w EB mixture, transfer it to a 25-mL volumetric flask, and dilute to volume. What is the concentration of EB in the resulting solution? Report your answer using units of molarity, % w/v, and ppm being careful to report each with an appropriate number of significant figures. Answer 0.2519 g mixture 0.02500 L × 0.116 g EB 100 g mixture × 1 mol EB 1006.7 g EB = 1.16 × 10 5 M w/v % 10 17 . 1 100 mixture
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This note was uploaded on 04/02/2012 for the course CHEMISTRY 222 taught by Professor Mcdonald during the Fall '11 term at University of Illinois, Urbana Champaign.

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AssignmentOneKey - Take Home Assignment #1 Key Please turn...

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