In a grignard reaction, one way to upgrade the experiment is to add a desiccant between two the cotton plugs. Why is this a better option than adding drying agents like Na2SO4 directly into the solution?
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In a grignard reaction, one way to upgrade the experiment is to add a desiccant between two the cotton plugs. Why is this a better option than adding drying agents like Na2SO4 directly into the solution?
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- 1. Several procedures for the analysis of caffeine involve extracting the caffeine into an organic non-polar solvent (such as methylene chloride CH2Cl2). This about your experiment and what is discussed in the introduction. What might the advantage be for this approach? What is a disadvantage? 2. Think about what you said in the question above. If your sample was espresso, would your answer change? Why? 3. I was careless and ended up using a wavelength other than the peak (Say 250 nm). Would I still be able to carry out the experiment successfully? What might be the reason that I do not get optimum results? 4. I carried out the experiment using a scratched (or several scratches) cuvet for one standard, and clear cuvets for others. How might my calibration curve change (improve or get worse and why)? Pllllz answer these questions as soon as possibleOrganic Chemistry Laboratory purposes: a. Why is it important to vent the separatory funnel (directed away from your face and body) after vigorous shaking? b. What is an disadvantage of using too little drying agent?You will be completing the extraction of caffeine with dichloromethane and water. In which solvent will the caffeine be found after the layers are mixed, and is this the top or bottom layer? A. Dichloromethane - top layer B. Dichloromethane - bottom layer C. Water - top layer D. Water - bottom layer
- you weigh your crude sample (1.538 g) and recrystallize with hot isopropanol. How do you know how much isopropanol to add?Why do you need to add boiling chips to the experiment? A. It decreases the boiling time B. It acts as a neutralizing agent to keep the pH at 7 C. It provides more surface area for a faster reaction D. It helps increase the pH to prevent having an acidic solutionWhich of these is NOT true of a good recrystallization solvent? Which of these is NOT true of a good recrystallization solvent? a) The compound is insoluble in the solvent when it is cold. b) The solvent boiling temperature is at least 40 °C. c) The solvent has many impurities. d) The compound is soluble in the solvent when it is hot.
- Calculate the Initial Concentration, in units of Molarity, for each reagent used in each of the three trials in this experiment.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 methodsIn an extraction procedure, it is advisable to: O put the aqueous layer down the drain put the organic layer in the aqueous waste throw away all layers as soon as you have extracted them save all layers until an experiment is complete
- List at least three differences between iodimetry and iodometry. Give the structure of sodium thiosulfate and its properties. Give the important reactions (balanced equations) involved in this experiment. Why is it that the starch is not added in the start of the titration but rather near the end point?Can you proceed with sample analysis even without standardizing the titrant solution? Why or why not? You have finished two trials of the sample analysis for the experiment and you noticed that the burette is almost empty (~5 mL remaining). Should you add more titrant before the next sample analysis or not? Why or why not?Nitrous Acid Test Procedure: Make a solution of 4 grams NaNO3 in 16 mL water. Put 2 mL of concentrated hydrochloric acid into a 10x75-mm test tube and add 0.5 ml of amine. Cool the solution in a water-ice slush to zero degrees celcius. Add the nitrile solution slowly, dropwise, until a drop of the reaction mixture gives a blue spot on starch-iodide paper. The following should be tested: (NOTE: Include the observations and reaction equation) A. PRIMARY ALIPHATIC AMINES (Like Butylamine of Cyclohexylamine) B. PRIMARY AROMATIC AMINES I. Aniline + nitrous acid; then heat. II. Aniline + nitrous acid; then B-Napthol.