a) In which of the below reactions is metal sulfide dissolution more energetically favorable? MnS + H* +→ Mn²+ + HS- CUS + H* +→ Cu²+ + HS- b) Classify each reaction as exothermic or endothermic based on the AG,º. c) What is the Kan of MnS and CuS? d) Which is more soluble?

a) In which of the below reactions is metal sulfide dissolution more energetically favorable? MnS + H* +→ Mn²+ + HS- CUS + H* +→ Cu²+ + HS- b) Classify each reaction as exothermic or endothermic based on the AG,º. c) What is the Kan of MnS and CuS? d) Which is more soluble?

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter22: Bulk Electrolysis: Electrogravimetry And Coulometry

Section: Chapter Questions

Problem 22.20QAP

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Question

a) In which of the below reactions is metal sulfide dissolution more energetically favorable?

MnS + H+ <--> Mn2+ + HS-

CuS + H+ <--> Cu2+ + HS-
b) Classify each reaction as exothermic or endothermic based on the (Delta)Gr0.
c) What is the Ksp of MnS and CuS?

d) Which is more soluble?

(Delta)Gr0 Values:

MnS: -218.0 H+: 0 Mn2+: -228.1 HS-: 12.2
CuS: -49.1 H+: 0 Cu2+: 65.5 HS-: 12.2

a) In which of the below reactions is metal sulfide dissolution more energetically
favorable?
MnS + H+ <- Mn2+ + HS-
Cus + H* +> Cu²+ + HS-
b) Classify each reaction as exothermic or endothermic based on the AG,º.
c) What is the Ksn of MnS and CuS?
d) Which is more soluble?

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