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Why is 80% alcohol the recommended solvent For the preparation of plant extract?
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- What is Phenylethyl alcohol and why would it be useful in agar?You resuspend 1 ml of of a purified chlorophyll sample in 10 ml of 80% acetone, and determine that the optical density of the solution (at 652 nm) is 0.88. What is the concentration of your original preparation?What is the purpose of the pentane extraction of spinach juice? Why wouldn’t we want to spot an aqueous solution onto the silica gel?
- If a sample of beeswax is found to have an acid number of 15.5 and saponification value of 71.2, the ester value of the sample is:How do multiple pigments exist if the chlorophyll extract appears green when placed on the paper?A researcher wishes to obtain a glycoside (an organic compound) from an aqueous plant extract using the solvent extraction technique. She therefore performs the following steps: Step 1: An aqueous solution (100 mL) containing 7 g of the glycoside was shaken with 50 mL of ethyl acetate. Step 2: The resulting aqueous layer from Step 1 was further shaken with 50 mL of dichloromethane. Given that: Kp for the glycoside in ethyl acetate-water = 0.8 Kp for the glycoside in dichloromethane-water = 0.9 Calculate the total mass of glycoside extracted. If the molar mass of the glycoside = 784.3 g/mol, calculate the molar concentration of the glycoside remaining in the aqueous layer after each extraction.
- What is the purpose of extracting coffee three times with dichloromethane? Why not five or six times?A mixture of dipeptides consisting of Lys-Gly, Thr-His, Ser-Leu, Glu-Gln was applied to column packed with cation-exchange resin at pH 6.0. Which of these dipeptides would be eluted from the column first? O Lys-Gly first O Thr-His first O Ser-Leu first O Glu-Gln first OA mixture of Thr-His and Ser-Leu firstWhat does the red dye Prontosil have to do with sulfa drugs?