Although the dissociation of an acid is commonly written as indicated in reactio

Question

Although the dissociation of an acid is commonly written as indicated in reaction 23-1, better representations of the process and the resulting equilibrium expression are: HA(aq) + H_2O(l) = H_3O^+ + A^- K = [H_3O^+][A^-]/[HA][H_2O] The equilibrium expression is usually simplified to equation 23-5 by multiplying both sides of the equation by the concentration of water and defining a new constant, the acid dissociation constant, K_a as [K][H_2O]. Is it a valid procedure to incorporate the water concentration in to the acid dissociation constant. Base your on the results of parts a and b of this problem.

Explanation / Answer

The concentration of water is very high and hence taken as a constant. There is no change in the intial and final concentration of water. Hence there is no problem in incorporating it into Ka

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