describe and explain the possible effect on your results of the following experimental errors or variations. a) you added only enough 3 M H2SO4 to bring the pH down to 4. b)your reaction mixture had an oily layer on top when you added the 3 M sulfuric acid. c) be cause of a label-reading error by a lab assistant the bottle labeled "salicylic acid from benzene" actually contained acetylsalicylic acid(aspirin).