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Chemical equilibrium and analysis of a mixture. (Warning! This is a long problem.) A

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

Solution for problem 18-9 Chapter 18

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 18-9

Chemical equilibrium and analysis of a mixture. (Warning! This is a long problem.) A remote optical sensor for CO2 in the ocean was designed to operate without the need for calibration.31 The sensor compartment is separated from seawater by a silicone membrane through which CO2, but not dissolved ions, can diffuse. Inside the sensor, CO2 equilibrates with HCO3 and CO3 2. For each measurement, the sensor is flushed with fresh solution containing 50.0 M bromothymol blue indicator (NaHIn) and 42.0 M NaOH. All indicator is in the form HIn or In2 near neutral pH, so we can write two mass balances: (1) [HIn] [In2] FIn 50.0 M and (2) [Na] FNa 50.0 M 42.0 M 92.0 M. HIn has an absorbance maximum at 434 nm and In2 has a maximum at 620 nm. The sensor measures the absorbance ratio RA A620/A434 reproducibly without need for calibration. From this ratio, we can find [CO2(aq)] in the seawater as outlined here: (a) From Beers law for the mixture, write equations for [HIn] and [In2] in terms of the absorbances at 620 and 434 nm (A620 and A434). Then show that (A) (b) From the mass balance (1) and the acid dissociation constant KIn, show that (B) (C) (c) Show that [H] KIn/RIn. (D) [In2

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Spencer Kociba CHEM 101 Lecture 11/15/16 THERMOCHEMISTRY ● Enthalpy ○ Represented as ΔH ○ Internal energy + pressure*volume ■ We will mostly be concerned with constant pressure. This is where the formula ΔH = ΔE + PΔV comes from ○ ΔH = q (enthalpy=heat gained or lost in the system) ● Properties of Enthalpy (ΔH ) ○ ΔH is directly proportional to mass ○ ΔH for a reverse reaction is equal in magnitude (quantity) but opposite in sign for the forwards reaction ○ Hess’s Law: ΔH is independent of the number of steps involved ■ If Reaction(1) + Reaction(2)=Reaction(3), then ΔH =3ΔH + 1H 2 ● Endothermic reactions ○ Gains heat from su

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Chapter 18, Problem 18-9 is Solved
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Textbook: Quantitative Chemical Analysis
Edition: 8
Author: Daniel C. Harris
ISBN: 9781429218153

Since the solution to 18-9 from 18 chapter was answered, more than 231 students have viewed the full step-by-step answer. The answer to “Chemical equilibrium and analysis of a mixture. (Warning! This is a long problem.) A remote optical sensor for CO2 in the ocean was designed to operate without the need for calibration.31 The sensor compartment is separated from seawater by a silicone membrane through which CO2, but not dissolved ions, can diffuse. Inside the sensor, CO2 equilibrates with HCO3 and CO3 2. For each measurement, the sensor is flushed with fresh solution containing 50.0 M bromothymol blue indicator (NaHIn) and 42.0 M NaOH. All indicator is in the form HIn or In2 near neutral pH, so we can write two mass balances: (1) [HIn] [In2] FIn 50.0 M and (2) [Na] FNa 50.0 M 42.0 M 92.0 M. HIn has an absorbance maximum at 434 nm and In2 has a maximum at 620 nm. The sensor measures the absorbance ratio RA A620/A434 reproducibly without need for calibration. From this ratio, we can find [CO2(aq)] in the seawater as outlined here: (a) From Beers law for the mixture, write equations for [HIn] and [In2] in terms of the absorbances at 620 and 434 nm (A620 and A434). Then show that (A) (b) From the mass balance (1) and the acid dissociation constant KIn, show that (B) (C) (c) Show that [H] KIn/RIn. (D) [In2” is broken down into a number of easy to follow steps, and 212 words. The full step-by-step solution to problem: 18-9 from chapter: 18 was answered by , our top Chemistry solution expert on 03/16/18, 04:33PM. This full solution covers the following key subjects: . This expansive textbook survival guide covers 55 chapters, and 1224 solutions. Quantitative Chemical Analysis was written by and is associated to the ISBN: 9781429218153. This textbook survival guide was created for the textbook: Quantitative Chemical Analysis, edition: 8.

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Chemical equilibrium and analysis of a mixture. (Warning! This is a long problem.) A