Kp for heterogeneous Equilibria (with (l))

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SUMMARY

The discussion centers on the existence and calculation of Kp for reactions involving liquid and aqueous states, specifically the reaction 3Cu(s) + 2NO3-(aq) + 8H+(aq) ⇔ 3Cu2+(aq) + 2NO(g) + 4H2O(l). Participants clarify that Kp is defined using the law of mass action, Kp = Kc(RT)Δng, and emphasize that Kp does not exist for reactions with reactants or products in liquid or aqueous states. The conversation also touches on the relationship between activities and pressure, questioning the validity of using fugacity in these contexts.

PREREQUISITES
  • Understanding of the law of mass action
  • Familiarity with Kp and Kc relationships
  • Knowledge of chemical equilibria involving gases and liquids
  • Basic concepts of activity and fugacity in thermodynamics
NEXT STEPS
  • Research the implications of the law of mass action on heterogeneous equilibria
  • Study the definitions and applications of Kp and Kc in chemical reactions
  • Explore the concept of activity and its relationship with pressure and concentration
  • Investigate the role of fugacity in ideal gas behavior and its application in chemical equilibria
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Chemistry students, educators, and professionals interested in understanding chemical equilibria, particularly those dealing with reactions involving both gaseous and liquid states.

ELiT.Maxwell
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Homework Statement


3Cu(s) + 2NO3-(aq) + 8H+(aq) ⇔3Cu2+(aq) + 2NO(g) + 4H2O(l)
Kp and Kc relationship? does Kp exist?
or HCl(g)⇔H+(aq)+Cl-(aq)

Homework Equations


Law of mass action, Kp=Kc(RT)Δng

The Attempt at a Solution


In lots of places contradictory results are there, some say that in Kp , (not clearly signifying presence of liquid state) that just take gaseous moles, and in some, Kp doesn't exist..we know that solvent and solid state can be ignored in all K .. Does Kp exist for a reaction including a reactant/product in aqueous or liquid form? (im not asking about thermodynamical constant which is quite crystal clear in definition by acivity)
 
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ELiT.Maxwell said:
Does Kp exist for a reaction including a reactant/product in aqueous or liquid form? (im not asking about thermodynamical constant which is quite crystal clear in definition by acivity)
Can you write activities of reactants and products as functions of P (fugacity)?
 
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if we assume ideal behaviour and remove concept of activity (by taking the measurement of species in bar and M) ..
a simple answer in yes or no would suffice... and 2nd part of question was whether Kc of Hcl reaction exists too
[sorry for my lack of knowledge in chemistry in general, that's why I am going back to strengthen my roots]
 

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