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?

Lab reagent, hypothesis test.a reference solution used as a lab reagent is purported to have a concentration of 5 mg/dl. six samples are taken from this solution and the following concentrations are recorded: (5.32, 4.88, 5.10, 4.73, 5.15, 4.75) mg/dl.these six measurements are assumed to be an srs of all possible measurements from solution.they are also assumed to have a standard deviation of 0.2, a normal distributin, and a mean concentration equal to the true concentration of the solution.carry out a significance test to determine whether these six measurements provide reliable evidence that the true concentration of the solution is actually not 5 mg/dl.