Postlab question 1a) 4-nitrobenzoic acid has a pka of 3.41. 3-fluorophenol has a pka of 8.40. ethyl-4-aminobenzoate is a basic compound. you will need the following information: the pka of hcl is –7; pka of carbonic acid is 6.52 and the pka of water is 15. you have a mixture of 4-nitrobenzoic acid and 3-fluorophenol that you wish to separate by extraction. the mixture is dissolved in methylene chloride. i) why would reacting the mixture with an aqueous solution of naoh not separate one substance from the other? ii) why would reacting the mixture with an aqueous solution of nahco3 work to separate one substance from this mixture from the other?