3. In the liquid-liquid extraction, there are two funnels with solutions of total volume 250 mL and 500 mL respectively. Using the ratio of 1 part of aqueous to 3 parts of ethyl acetate for liquid-liquid extraction, how much of ethyl acetate is needed for each funnel?
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- 1 g of organic matter dissolved 20 times more in ether than water is dissolved in 500 cm3 of water. Organic matter will be extras from the aqueous phase using 20 cm3 of ether each time. How many times should the extraction phase be repeated to extraction at least 90% of organic matter massively?Why was it necessary to keep the total volume of the reagents after mixing constant in all the kinetic runs (i.e., why was it necessary to add distilled water in inverse proportion to the quantity of Solution 1 that was required)?10g coffee 4g sodium carbonate 40m dichloromethane 160ml distilled water coffee filter What are the principles behind caffeine being extracted from coffee using the above items? 1st sodium carbonate mixed with coffee then brought to a boil for 20min then solution/grinds are filtered. Then solution is added to a separatory funnel with 15ml of dichloromethane and two layers are observed so the bottom layer with DCM contains the caffeine, then this layer is collected in a beaker and dried out using molecular seeds. Then the solvent is brought to a boil with crude caffeine remaining and recystallized using 95% ethanol and brought to a boil again. Then the contents are vaccum filtered and allowed to dry resulting in 30mg caffeine.
- Extraction of the aqueous salicylic acid solutions with 10% ethyl acetate/hexane (density ~ 0.7 g/ml) will give two layers in the separatory funnel. a. Will the aqueous layer be the upper layer or the lower layer? b. If dichloromethane (density ~ 1.3 g/ml) were substituted for the 10% ethyl acetate/hexane solution, which layer would be the aqueous layer?Solution Calculations Using unit analysis, clearly show the set-ups for your calculations. You wish to prepare 50.0 mL of 2.30 x 10–2 M solution of Levothyroxine (hint-how many grams will you need of Levothyroxine?) 1. Describe how to prepare this solution from the pure drug and deionized water. Analytical balances and volumetric flasks are available to you. (Assume that Levothyroxine dissolves in water, at least to the extent necessary for this problem.) Use complete sentences in your description of the solution preparation process. a. A patient is given 2.0mL of a 3.00% (m/v) solution of Levothyroxine, how many milligrams of the drug did they receive? b. What is the molarity of a 3.00% (m/v) solution of Levothyroxine?Which statement about liquid-liquid extraction is not correct? * A- A solvent must be available that is miscible with the solution containing the substance to be extracted. B- The solvent used for extraction must have a good ability to dissolve the desired substance. C- The denser solution forms the bottom layer in the extraction funnel. D- The extraction funnel must be vented during the extraction procedure to prevent excessive build-up of pressure inside the extraction funnel. E- All these statements are correct.
- Extraction of the aqueous salicylic acid solutions with 10% ethyl acetate/hexane (density ~ 0.7 g/ml) will give two layers in the separatory funnel. Will the aqueous layer be the upper layer or the lower layer? If dichloromethane (density ~ 1.3 g/ml) were substituted for the 10% ethyl acetate/hexane solution, which layer would be the aqueous layer?Fill in the blanks: a) The component of the mixture that becomes a water soluble salt by treating the two component mixture with sodium hydroxide solution has the highest _______________. b) The lower phase in equipment used for liquid-liquid extraction in a water-dichloromethane mixture is_____________, because _______________. c) The component of the mixture that becomes a water-soluble salt is the one with the greatest ______________1. Why should the stopper always be removed from a separatory funnel whenever a liquid is being drained through the stopcock?2. The distribution coefficient, KD (ether/water), between ether and water for aspirin at room temperature is 3.5. What weight of aspirin would be extracted by a single extraction with 60 ml of water from a solution of 10 grams of aspirin in 100 ml of ether? Calculate the weight of aspirin which would be removed by three extractions with 20 ml portions of water.
- Which of the following is expected to achieve the best recovery of an organic compound from an aqueous solution? 1.Three extractions with 20 mL of ethyl acetate per extraction (60 mL total) 2.Two extractions with 30 mL of ethyl acetate per extraction (60 mL total). 3.One extraction with 60 mL of ethyl acetate. 4.In theory these extractions yield identical recoveries of the organic compound.Compound X has a distribution coefficient (K) of 5 for ether/water. If 5.0 g of compound X were dissolved in 500.0 mL of water, how many grams of compound X would be recovered from the water layer after two consecutive extractions using 50.0 mL portions of fresh ether from each extraction(c) What is the minimum distribution ratio that permits removal of 99% of a solute from 50.0 mL of water with (i) two 20.0-mL extractions with an organic solvent; (ii) four 10.0-mL extractions with the organic solvent?
