What the heck is pKa? Well, pKa is the negative log of Ka: pKa = - log (Ka)Nifty, but what the heck is Ka? Ka is the equilibrium constant expression for the reaction of a weak acid with water. (aren't you glad you took this course?) For instance: H2CO3 (aq) + H2O (l) double arrows HCO3- (aq) + H3O (aq)Given all of this fun info, why does the equation for the Ka of carbonic acid not include water? Water is a reactant Water can evaporate Water is a pure liquid The equation can be written without including the water

When everything is in a homogenous phase then water can be considered while writing the expression…

Answered: Given all of this fun info, why does…

Chemistry & Chemical Reactivity

10th Edition

ISBN:9781337399074

Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel

Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel

Chapter16: Principles Of Chemical Reactivity: The Chemistry Of Acids And Bases

Section: Chapter Questions

Problem 127SCQ

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What the heck is pK_a? Well, pK_a is the negative log of K_a:

   pK_a  = - log (K_a)

Nifty, but what the heck is K_a?  K_ais the equilibrium constant expression for the reaction of a weak acid with water. (aren't you glad you took this course?) For instance:

H₂CO₃ _(aq) + H₂O _(l)  double arrows HCO^3- _(aq)  + H₃O _(aq)

Given all of this fun info, why does the equation for the K_a of carbonic acid not include water?

		Water is a reactant
		Water can evaporate
		Water is a pure liquid
		The equation can be written without including the water

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