he analgesic aspirin is soluble at 25oC in water to the extent of 3mg/mL and in ethylacetate to the extent of 86 mg/mL. The approximate distribution coefficient of aspirin in these two solvents is __
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The analgesic aspirin is soluble at 25oC in water to the extent of 3mg/mL and in ethylacetate to the extent of 86 mg/mL. The approximate distribution coefficient of aspirin in these two solvents is __
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- Although other solvents are available, dichloromethane(CH₂Cl₂) is still often used to “decaffeinate” drinks because thesolubility of caffeine in CH₂Cl₂ is 8.35 times that in water.(a) A 100.0-mL sample of cola containing 10.0 mg of caffeine is extracted with 60.0 mL of CH₂Cl₂. What mass of caffeine re-mains in the aqueous phase? (b) A second identical cola sampleis extracted with two successive 30.0-mL portions of CH₂Cl₂.What mass of caffeine remains in the aqueous phase after each extraction? (c) Which approach extracts more caffeine?A pharmacist needs 250 mL of 80% v/v alcohol to macerate a dried sample weighing 100grams. If the available concentration of alcohol is 95% v/v, compute the volume of water andvolume of 95% alcohol required to prepare the desired concentration?The distribution coefficient, KD (C ether/C 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 150 mL of water from a solution of 10 gms of aspirin in 100 mL of ether? Calculate the weight of aspirin which would be removed by three extractions with 50 mL portions of water.
- The partial molar volumes of acetone and chloroform, in a solution in which the molar fraction of chloroform is 0.4693, are 74.166 cm3mol-1 and 80.235 cm3 mol-1, respectively. What is the volume of 1,000 kg of this solution? Data: M.M. (acetone) = 58.08 gmol-1; M.M. (chloroform) = 119.07 gmol-1.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.1) How many milliliters of 70% ethanol and 20% ethanol must be mixed to prepare 500ml of 30% ethanol? 2) A gaseous blend of nitric oxide and nitrogen (NOmax) contains 0.09% v/v nitric oxide (NO) and 99.92% v/v nitrogen. Express the strength of nitric oxide in PPM (round to whole number) 3) The ratio strength of a 10mL vial of neostigmine methylsulfate injection USP is 1:1500.Calculate the amount of neostigmine methylsulfate in milligrams contained in the 10mL vial. (Round to the whole number).
- The distribution coefficient, KD (C water/C ether), between ether and water for aspirin at room temperature is 0.30. What weight of aspirin would be extracted by a single extraction with 300 mL of water from a solution of with a concentration of 0.67 M? Calculate the weight of aspirin which would be removed by three extractions with 100 mL portions of water. Compare the weight of solute extracted in single extraction process with the triple extraction process. Take note: The volume of the solution is 100mlPrepare the following solutions: 100.0 mL 0.0500 M stock Ca2+ solution 50.0 mL 0.0050 M working standard Ca2+ solution from 0.0500 M Ca2+What will be the new boilng point of 498ml benzene (Kb = 2.53 oC•Kg/mol; Bp = 80.1oC) when mixed with 18g of naphthalene (MW = 128.17 g/mol) to make a non- eletrolyte solution? Density of benzene = 0.876 g/ml)
- Sodium chloride (NaCl) was isolated from SiO2 and CaCO3 by dissolving it in distilled water. Unmentioned is that CaCO3 is slightly soluble in water (0.001 g/100 mL). Describe the effect this fact will have on each component of the mixture: will the “isolated“ mass of each be greater than, equal to, or less than that in the sample?Assume you dissolve 30.0 g of cobalt sulfate heptahydrate (CoSO4.7H2O) in 500 ml of a 1.0 MH2SO4 solution. Calculate the following for CoSO4.7H2O in this solution:(The Specific Gravity of 1.0 M H2SO4 @ 20°C is 1.0814 g/ml.) Molality, Mole fraction and Weight percentageSolution 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) C15H11I4NO4 drug. (hint-how many grams will you need of this drug?) Describe how to prepare this solution from the pure drug and deionized water. Analytical balances and volumetric flasks are available to you. (Assume that this drug dissolves in water, at least to the extent necessary for this problem.) Use complete sentences in your description of the solution preparation process. Thank you!!
