Answered: Mn in groundwater A ground water has…

Introduction to Chemical Engineering Thermodynamics

8th Edition

ISBN:9781259696527

Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Chapter1: Introduction

Section: Chapter Questions

Problem 1.1P

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Question

Mn in groundwater
A ground water has the following conditions:
{Mn2+ (aq)} = 1.0x10 -5
pH = 7.0 (i.e., {H+ } = 1.0x10-7)
Saturated with oxygen from the atmosphere: {O 2(aq)} = 2.63x10 -4
T = 25 °C
(a) Write the balanced equation for oxidation of reduced manganese,
Mn2+ (aq), by dissolved oxygen (O 2(aq)) to generate MnO 2(s)
(manganese dioxide) or MnOOH(s) (manganite), respectively.
(b) Determine whether each of the above two reactions is
thermodynamically favorable in the ground water. Which phase of
the manganese oxide is more stable in the ground water?
(c) If groundwater is at 5 oC, does oxidation of Mn 2+ (aq) by dissolved
oxygen to generate MnO 2(s) become more or less favorable?
Calculate the saturated {Mn 2+ (aq)} assuming the water pH remains
at 7.0 and the dissolved oxygen concentration is 3.73x10 -4 M.

25C and 1 atm

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