Question

In an aqueous solution of a weak acid, HA, the assumption is often made that [HAJequilibrium concentration of the acid is sufficiently large compared to Ka. [HAlinitial- This approximation is reasonable if the initial What multiple of Ka must the initial concentration of a weak acid exceed, for the initial concentration and the equilibrium concentration to be within 8.01 percent of each other?

Answer 1

Answer:

Let introductory fixation [HA]0= xM

The harmony fixation [HA]= (100-8.01)/100xM

=0.9199xM

The adjustment in fixation [HA]0-[HA]= 0.0801x M =[A^-]=[H^+]

The balance consistent K_a = [H^+][A^-] / [HA]= (0.0801x *0.0801x) /0.9199x = .00697x

Henceforth, the underlying centralization of a feeble corrosive is x/Ka =x/0.00697x =143.5

Henceforth, numerous of Ka should the underlying convergence of a powerless corrosive surpass, for the underlying fixation and the balance focus to be inside 8.01 percent of one another will be =143.5-1 =142.5

various of Ka