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- Part B: Miscibility of liquids 1. Place 10 drops of propan-2-ol into each of two DRY semi-micro test tubes. 2. Add 10 drops of water to one test tube and 10 drops of cyclohexane to the other test tube, shake and observe whether the two liquids in each test tube are miscible. Record your results then discard the contents of the test tubes into the organic waste container. 3. Place 10 drops of water in a clean semi–micro test tube and add 10 drops of cyclohexane to it. Record whether the two liquids are miscible. If two layers form (i.e. the liquids are immiscible) add a drop of blue food dye to the mixture and shake, then allow the two layers to reform. Based on your observation, decide whether the food dye is more soluble in water or cyclohexane and then discard the mixture into the non–halogenated waste container. Record whether the combinations of liquids shown below are miscible. Water Cyclohexane Propan-2-ol Cyclohexane9. Any organic solvent waste generated in this experiment should be collected in your fume hood and poured into the waste container as directed. This waste should not be poured down the drain. True Falseyou weigh your crude sample (1.538 g) and recrystallize with hot isopropanol. How do you know how much isopropanol to add?
- write an equation for this lab and explain the observations that would occur: measure out 10 mL portion of 10% sodium sulphate into a clean test tube. Add 8 drops of 50% sulphuric acid and swirl. Count the number of drops (swirl after each drop) of 30% calcium chloride needed to produce a precipitate of calcium suplhate.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 possible2. Any organic solvent waste (besides methanol and ethanol) generated in this experiment should be collected in your fume hood and poured into the waste container as directed. This waste should not be poured down the drain. true or false
- How do you separate sodium hydroxide from the crude mixture?Column Chromatography of 9-Fluorenone Experiment Introduction: Column chromatography is an important chromatography method used to separate and purify organic compounds. Column chromatography is typically used to separate impurities and purify products from chemical reactions, including separating unused starting material from products. Column chromatography is very similar to Thin Layer Chromatography (TLC) because it relies on a solid stationary phase (absorbent) and liquid mobile phase (eluant) to separate organic compounds based on their different polarities. In column chromatography, the stationary phase is a solid absorbent, typically silica gel or alumina, with a liquid coating packed into a glass column. The stationary phase is typically very polar. An eluant (mobile phase) solvent travels down the column and the separation occurs as the organic compounds enter into equilibria with the stationary and mobile phases. The polarity of the eluant may be adjusted from non-polar…Chemistry Resorcinol gives a false positive with the Duquenois–Levine test. Why?
- In the determination of the reaction order in the experiment, which would provide the greatest error in the recorded reaction time? a. No starch solution was added to all mixtures. b. The reagents were mixed after equilibration. c. The timer was stopped consistently for the different mixtures. d. Acetone was added first before iodine in the test tube.4. Suppose you have a mixture of saturated aqueous sodium chloride (brine) and your 2-bromo-2-methylbutane product in a separatory funnel. Use densities to predict which phase will be the top layer in the funnel. a. 2-bromo-2-methylbutane (organic phase) b. saturated sodium chloride (aqueous phase) c. hard to predict since densities are both very close to 1.18 g/mL d. there would only be one phase since the substances are miscibleHazards of this experiment include Melting point apparatuses that will be very hot Reagents that may be toxic and/or irritate skin and eyes Glass capillaries and thermometers 4. All of these
