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Quantitative Analysis

by: Gavin Harvey

Quantitative Analysis CHEM 253

Marketplace > University of Idaho > Chemistry > CHEM 253 > Quantitative Analysis
Gavin Harvey
GPA 3.91


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Class Notes
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This 7 page Class Notes was uploaded by Gavin Harvey on Friday October 23, 2015. The Class Notes belongs to CHEM 253 at University of Idaho taught by Staff in Fall. Since its upload, it has received 20 views. For similar materials see /class/227961/chem-253-university-of-idaho in Chemistry at University of Idaho.


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Date Created: 10/23/15
Review Sheet 1 Monday December 8 2003 Know concepts of 0 Gaussian Curve 0 Systematic Error 0 Indeterminate Error 0 ttest 0 qtest o Propagation of Uncertainty 1 The Fe content of a meteorite was found to be 126 119 130 127 125 0 Find the 50 and 95 con dence limit for the Fe analysis 0 Describe in words what the confidence interval concept means Chem 253 Final Review 1 1 Answer First calculate g 125 Then standard dev s 04 For n 5 or df 4 nd the 50 con dence limit in table 42 0741 Plug into the ttest equation above 039 074104 7 l xi 2125 J J 125 i0l o This calculation tells us that there is a 50 chance that the true mean LL lies within the interval 125 i 01 Now nd the 95 CL 11 5 df 4 8610 m iml25i05 u xii 2125 n E 0 Note that the CL interval widens Chem 253 Final Review 1 2 Decide whether any of the following values can be rejected at the 90 con dence level 0217 0224 0195 0221 0221 0223 2 Answer d 0217 0195 Q O786 w 0223 0195 n 6 use Table 46 Qtable 056 Q gt Qtable so the point can be discarded Chem 253 Final Review 1 3 3 Calculate the pH of 0050 M acetic acid K2l 175e 5 CH3COOH CH3COO39 H 0050 O O X X X x2 0050 x 175e 5 x 935e 4 pH303 4 What is the molar solubility of PbClz KSp 17e5 KSp Pb2C1392 2x2x 17e5 x 16e2 M Chem 253 Final Review 1 4 5 What is the solubility of PbC12 in 010 M NaCl Compare the answer with 4 s 010 2x2 x 17e5 0102 x 217e5 X 17e3 M 6 What is the pH of a 020 M solution of pyridine C5H5N in aqueous solution The Kb for pyridine is 14 x 109 39T N I O lt Ho H H Chem 253 Final Review 1 5 6 Answer C5H5Naq H20l 4 gtC5H5NHaq OHaq 020 0 0 39X quot X X 020X X X Assumption 020 gtgt X 2 KbHB quot01 x 14gtlt10 9 B 020 x 2 x 14gtlt10 9 020 x HO39 17 x10395 Now calculate the pH from OH39 17 X 10395 KW 1FH039 101 x 103914 1117x10395101x103914 if 59 x103910 pH 923 Chem 253 Final Review 1 7 What is the molar concentration of 065 ww KC 7455 gmol Density 100 gmL Assume 1 g of solution 00065 1 g 00065 g KCl 00065 g KCl mol 7455 g 1 000100 L 87e2 M Chem 253 Final Review 1


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