(Answered) In an aqueous solution of a weak acid ha the assumption is

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In an aqueous solution of a weak acid, HA, the assumption is often made that [HA]_equilibrium = [HA]_initial. This approximation is reasonable if the initial concentration of the acid is sufficiently large compared to K_a.

What multiple of K_a must the initial concentration of a weak acid exceed, for the initial concentration and the equilibrium concentration to be within 9.40 percent of each other?

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