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Spike recovery and detection limit. Species of arsenic found in drinking water include

Quantitative Chemical Analysis | 8th Edition | ISBN: 9781429218153 | Authors: Daniel C. Harris ISBN: 9781429218153 475

Solution for problem 5-18 Chapter 5

Quantitative Chemical Analysis | 8th Edition

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Quantitative Chemical Analysis | 8th Edition | ISBN: 9781429218153 | Authors: Daniel C. Harris

Quantitative Chemical Analysis | 8th Edition

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Problem 5-18

Spike recovery and detection limit. Species of arsenic found in drinking water include AsO3 3 (arsenite), AsO4 3 (arsenate), (CH3)2AsO 2 (dimethylarsinate), and (CH3)AsO3 2 (methylarsonate). Pure water containing no arsenic was spiked with 0.40 g arsenate/L. Seven replicate determinations gave 0.39, 0.40, 0.38, 0.41, 0.36, 0.35, and 0.39 g/L.15 Find the mean percent recovery of the spike and the concentration detection limit (g/L). 5

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2/10/2016 Entropy and Free Energy - Entropy (a.k.a. randomness) and heat energy combine into concept of free energy to explain processes that occur Spontaneous Processes - Any process that occurs w/o input of additional energy (i.e. w/o outside intervention) Ex: A ball rolling down a hill. - It doesn’t matter how fast the process occurs. Ex: The slowing of Earth’s rotation over millions of years. Ex: ◦ CH 4 2O → 2O + 2H 2 ∆H 2 rxn= -892kJ (exothermic) o Very slow reaction H + HO → H O ∆H ◦ = -56.2kJ (exothermic) 2 rxn - Almost all exothermic reactions (when ∆H is negative) are spontaneous. o But endother

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Textbook: Quantitative Chemical Analysis
Edition: 8
Author: Daniel C. Harris
ISBN: 9781429218153

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Spike recovery and detection limit. Species of arsenic found in drinking water include