The precipitation/dissolution of calcium carbonate is described as below: CaCO3(s) + H+ (aq) = Ca2+ (aq) + HCO3- (aq) (a) Calculate the ∆G° and equilibrium constant of this reaction (at 25°C and 1.0 atm). (b) Is this reaction exothermic or endothermic? (c) A municipal water supply is just saturated with respect to CaCO 3(s) at 25°C. After passing the distribution line (25°C), the water enters a residence at 15°C, and then is heated to 60°C in a water heater. What will be the condition of the water (i.e., oversaturated or undersaturated) with respect to CaCO 3(s) (i) as it enters the residence and (ii) as it is in the water heater, respectively? (hint: just saturated means Q = K; oversaturated means Q > K; undersaturated means Q < K)

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
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The precipitation/dissolution of calcium carbonate is described as below:
CaCO3(s) + H+ (aq) = Ca2+ (aq) + HCO3- (aq)
(a) Calculate the ∆G° and equilibrium constant of this reaction (at 25°C
and 1.0 atm).
(b) Is this reaction exothermic or endothermic?
(c) A municipal water supply is just saturated with respect to CaCO 3(s) at
25°C. After passing the distribution line (25°C), the water enters a
residence at 15°C, and then is heated to 60°C in a water heater.
What will be the condition of the water (i.e., oversaturated or
undersaturated) with respect to CaCO 3(s) (i) as it enters the residence
and (ii) as it is in the water heater, respectively?
(hint: just saturated means Q = K; oversaturated means Q > K;
undersaturated means Q < K)
 
 
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