343Expts1and2unksolid_liquid(2)

An enzymatic method for determining alcohol in the wine is evaluated by comparison with a gas-chromatography (GC) method. The same sample is analyzed several times by both methods with the following results (% ethanol). The values of alcohol for both enzymatic and GC methods are shown in Table 1. Using a suitable test, determine whether the enzymatic method gives the same value as the GC method at 95% confidence level.

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19. What is thin layer chromatography (TLC) LEAST useful for from the list below? A) To determine if crystallization or distillation may be more effective for a separation B) To determine the number of components in a mixture C) To determine the appropriate solvent for column- chromatographic separation D) To monitor the progress of an organic synthesis reaction 14. The solubility of salicylic acid in water is 7.8g/100ml at 100°C and 0.25g/100ml at 25°. Estimate how much water is needed to recrystallize a 19g sample of salicylic acid? A) 150ml B) 250ml C) 300ml D) 400ml

You are given a 1:1 (by weight) solid mixture of vitamin C and vitamin A, and you are going to use liquid-liquid extraction to separate one from the other (chemical structures are given below). If you decide to use water (density, 1 g/mL) and ethanol (density, 0.789 g/mL) as your extraction solvents, will this separation be successful? Why or why not? он HO HO. HO HO Vitamin C (ascorbic acid) Vitamin A (retinol)

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PART ONE: Preparation of FECNS* Solution Prepare the two solutions in table 1 by accurately measuring the required volumes of distilled water and CNS into two labeled test tubes. The absorbance of the solutions must be measured soon after adding the Fe" solution from a buret. TABLE 1 Fe 5 ml 5S mL Solution Distilled Water CNS 2 mL Total Volume 3 ml 2 ml 10 ml 3 mL 10 ml In this part of the experiment you are to explore what the above quote means. As a PRELIMINARY Exercise, formulate a hypothesis as to what would happen under each of the following circumstances: 1. 1ml of 0.0020 M CNS' solution is added to the unused portion of solution 1 in the test tube 2. One drop of 0.20 M CNS solution is added to the unused portion of solution 2 in the test tube.

An oil sample had its iodine number determined using the pyridinium tribromide method. The sample and reagents used are as follows: Oil sample: 0.19 mL, density: 0.954 g/mL Pyridinium tribromide: 0.472 g Na2S203: 0.1 M, endpoint 27.68 mL %3D What is the approximate Bromine Number? O 138 89 O 120 O 200

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Post-lab Questions 1. What would it mean if the melting point had a wide range in temperature rather than a narrow range of one to two degrees? Normal BIIIU X2| X² I → fx | Ix 2. Is your percent recovery of crystals within reason of what you would expect? Explain your anwer. Normal BIIIU X2| X² | → fx | |图|二 3. If you had chosen petroleum ether instead of your solvent what would happen? BII|U X2| X² | → fx | Ix Normal 4. Would there have been a change in your results if activated carbon was not added to the solution before recrystallization? BIIIU X2| X² | → Normal fx | |图|||| !! !! II II

Table 1 lists 33 pure compounds, several of which you will select to mix with each of your unknowns, so that you can determine the melting points of the mixtures, and thus the identity of the unknowns.   Table 1.  Known Compounds for Melting Point Experiment     COMPOUND mp range (oC)   COMPOUND mp range (oC)   1)   1,4-dimethoxybenzene   54-56        21)   4-nitroaniline   146-149   2)   2-phenylphenol   57-59        22)   1-napthoic acid   158-160   3)   diphenylacetylene   59-61        23)   salicylic acid   159-161   4)   2,4,6-trichlorophenol   64-66        24)   triphenylmethanol   160-162   5)   biphenyl   68-70        25)   sulfanilamide   165-167   6)   methyl 3-nitrobenzoate   78-80        26)   4-bromoacetanilide   165-169   7)   naphthalene   80-82        27)   itaconic acid   165-168   8)   vanillin   81-83        28)   d-mannitol   166-168   9)…

Which statement is true? Statement 1: In Thin Layer Chromatography (TLC), the polar compounds will have a greater Rf value compared to that of non-polar compounds.Statement 2: The stationary phase in TLC is polar.

wwwd ICTor, KI, IS. traveled by the fastest compound divided by distance traveled by the slowest compound ce traveled by the slowest compound divided by distance traveled by the fastest compound ance traveled by the solvent divided by distance traveled by the compound distance traveled by the compound divided by distance traveled by the solvent 23-The maximum quantity of a mixture that can be separated with a given efficiency by a particular process a)-Capacity factor b)-Delectability c)-Efficiency d-Load capacity 24- The distribution coefficient of a compound is 1 and its concentration in organic layer is 3 M. Then, its concentration in aqueous layer is a)-4 M b)-3 M c)-2 M 25-It is an apparatus in which one or more solutes are transported from one fluid to another through a membrane a) reverse osmosis b)Dialyzer c) Electrophoresis d)Gas chromatography 26- Which are commonly used as adsorbents? a)Ethanold water b)Helium& Argon c) Silica gel &alumina 27- The photoionization detector in…

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5. EXTRACTION To 1 ml. of bromine water in a test tube add .5ml chloroform or carbon tetrachloride. Note the color of the liquid layers. Which layer is more colored? What do you call such liquids which do not form a homogenous mixture? Can you possibly make them homogenous? How? Transfer the mixture into a separatory funnel and add 2 ml. more of bromine water and add 1 ml. more of chloroform of carbon tetrachlorides then shake to effect proper mixing. Let out the lower layer through the stem of the funnel. Again add another 2 ml. to chloroform or carbon tetrachloride to the aqueous solution in the funnel and shake as before. How does the color of the chloroform or carbon tetrachloride layer compare with the first extract? How do you explain the difference? Is it possible that after several extractions the chloroform layer will become colorless? Why?