A student forgot to add the mass of the unknown solute in trial 1 to the mass of the solute that was weighed for trial 2 and then added to the cyclohexane-solute solution used in trial 1. How would this omission affect the calculated molecular weight of the solute?
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A student forgot to add the mass of the unknown solute in trial 1 to the mass of the solute that was weighed for trial 2 and then added to the cyclohexane-solute solution used in trial 1. How would this omission affect the calculated molecular weight of the solute?
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- Read the detailed procedure of an experiment in your screen. Evaluate each step in the procedure whether it belongs to HOMOGENIZATION, EXTRACTION, PURIFICATION/CONCENTRATION, DATA TREATMENT, or INSTRUMENTAL ANALYSIS step.A yellow compound, dissolved in methylene chloride, is added to a chromatography column. The elution is begun using petroleum ether as the solvent. After 6 L of solvent have passed through the column, the yellow band still has not traveled down the column appreciably. What should be done to make this experiment work better?which procedure will produce 200ml of a solution that is 2.5%by volume alcohol of water?
- If an analytical method relies on a measurable property of an analyte that can be correlated with the amount of the said analyte, what type of analytical method is it? Oxidative methods Instrumental methods Blank Correction methods Classical methodsA student properly sets up a column chromatography experiment. Although the mixture is soluble in the mobile phase, the sample appears "stuck" at the top of the column and will not elute regardless of how much solvent is applied. What could be the cause of this problem and what could the student do to try and achieve a successful separation?What do you call the type of analytical method that relies on the absolute stoichiometric equivalences of balanced chemical reactions in order to compute the amount of analyte present in the sample? Oxidative methods Instrumental methods Classical methods Blank Correction Methods
- How would your calculation of the Molarity of KMnO4 have been affected (Higher, Lower, No Change) if . . . you recorded the endpoint volume and then noticed that the color had faded . . . . you did not add more KMnO4 solution? you were unable to complete the 3rd Trial and stored your KMnO4 solution in your desk for 3 days before completing the 3rd titration with the stored solution? you had added twice as much sulfuric acid as was called for in the procedure?Which is the correct order of elution of a gas chromatography that has a polar column that contains water, acetone, and n-propanol.For this experiment, yield was not important, but in onsite lab, as well as large-scale processes, a good yield is crucial in the success of a purification step. In what ways do you think a high yield can be assured in recrystallization?
- What is the percentage weight of the chloride ions in trial 1? What is the percentage weight of the analyte in trial 1? What is the gravimetric factor involved?*In paper chromatography, a rectangular piece of filter paper serves as the mobile phase stationary phase eluent solute sample spots1,4‐Dimethoxybenzene (0.642 g) was dissolved in 2.0 mL acetic acid in a 25 mL Erlenmeyer flask using heat from a hot plate. Once the solid dissolved, 1.0 mL tert‐ butanol was added, and the reaction mixture was cooled in an ice bath. Then 2.0 mL concentrated sulfuric acid was added in 2‐3 drop portions,stirring the mixture after each aliquot. After the addition, the flask was removed from the ice bath and allowed to sit at room temperature for 15 minutes. Then 1.0 mL water was added dropwise to dilute the acid and the reaction mixture was added to 40 mL cold water in a 100 mL beaker. The solid was vacuum filtered and washed with 5 mL cold water, giving 52 g filtrate. The product wasrecrystallized from 4.5 mL methanol, yielding 0.317 g purified 1,4‐di‐tert‐butyl‐2,5‐dimethoxy benzene (27.2% yield). What is the atom economy, e-factor, and effective mass yield?
