A mixture of 5 mL of acetone (boiling point 56 ° C) and toluene (boiling point 111 ° C) was separated by fractional distillation. At the end of the distillation, 2.5 mL of the fraction 1 and 1.6 mL of fraction 2. The percent recovery of toluene is: a.39% b.50% C.32% d.82%
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- compound A = 0.02 g compound B = 0.012 g If 20 ml of solvent is used, which is the best solvent to useCompounds A and B are soluble in water and ether as shown: Solvent Compound A Compound B Water 10 g/mL 1 g/mL Ether 0.5 g/mL 10 g/mL a) Determine the distribution coefficient for compound A b) Determine the distribution coefficient for compound B. c) How many percent of compound B is removed by three 10-mL portions of ether from 100-ml aqueous solution containing 1 gram of compound B?Which of the ff is not true about recrystallization? a. acetanalide recrystallized only at cold temp b. congo red stain is removed by using animal charcoal c. acetanalide can be dissolved in hot h20
- Which is more efficient in separating the components of a liquid mixture, simple or fractional distillation? Defend using the results of the experiment below: Distillate Component(s) First 9 mL Ethanol Second 10 mL Water Percentage of ethanol: simple = 63.34%fractional = 76.67% Percentage of loss: Simple = 16.33%Fractional = 1%A particular extraction proceeds with a distribution coefficient of 6. The system consists of 3.5 g of compound X dissolved in 60 mL of water (solvent 1). The effectiveness of three 60-mL extractions with n-hexane (solvent 2) is compared with one 180-mL extraction with n-hexane. Questions: 1. How many grams of compound X will be recovered in -hexane in the first extraction? 2. How many grams of compound X will be recovered in water in the first extraction? 3. How many grams of compound X will be recovered in n-hexane in the third extraction? 4. How many grams of compound X will be recovered in water in the third extraction?What is the concentration in units of grams of dye per liter of solution ,of the dilute dye solution that is produced as follows? transfer 19.53 ml of stick solution (6.10g/L) to a 200.0Ml volumetric flask and dilute to the 200 ml line with deionized water. Correct number of significant figs
- A 0.8250 g of soda ash sample was dissolved in distilled H O and diluted to 250-mL using a volumetric flask. A 50.00 mL aliquot portion of the dilute soda ash solution needed 4.50 mL of 0.1200 M HCl to reach the phenolphthalein end point and 10.00 mL to reach the methyl orange end point. From the volumes of HCl needed to reach the phenolphthalein and methyl orange endpoints, how many millimoles of NaHCO are there in the aliquot portion that was titrated?A tea bag containing 15 grams of tea leaves with 0.7% of caffeine was used in solid-liquid extraction with 200ml of distilled water followed by liquid-liquid extraction using DCM. If 50.0mg of caffeine requires 10 ml of water and 3.0ml of DCM to be dissolved, how much caffeine can be extracted using 70.0ml of DCM? a. 4.8 x 10^-2 b. 5.7 x 10^-2 c. 3.8 x 10^-3 d. 5.8 x 10^-3please i need your help A particular extraction proceeds with a distribution coefficient of 6. The system consists of 3.5 g of compound X dissolved in 60 mL of water (solvent 1). The effectiveness of three 60-mL extractions with n-hexane (solvent 2) is compared with one 180-mL extraction with n-hexane. Questions: 1. How many grams of compound X will be recovered in n-hexane in the third extraction? 2. How many grams of compound X will be recovered in water in the third extraction? 3. How many grams of compound X will be recovered in -hexane in the first extraction? 4. How many grams of compound X will be recovered in water in the first extraction?
- Compound X is steam distilled at 92°C under the pressure of 0.977 atm. Amount of water in distillate is found to be 12.1023 g and amount of the compound X is 19.4023 g. Determine the molecular weight of compound X. (P°w=0.746 atm at 92°C) Determine the % error in your experiment if the actual molecular weight of the compound X is 106.16 g/mol.How many milliliters of a thimerosal 25% stock solution must be used to prepare 100 ml of thimerosal topical solution of 1:1000 ratio strength? A diphenhydramine elixir contains 12.5 mg drug in one teaspoon. The volume of oral vehicle that is to be added to 100 ml of this elixir to reduce its strength by one half its original strength is: When preparing an ounce of 1% hydrocortisone cream the technician made an error and added 200 mg of hydrocortisone in the preparation. Calculate the additional amount of hydrocortisone powder that should be added to the 1 ounce cream to make the strength 1%. Onabotulinumtoxin A (BOTOX) is available in a 100 units vial for reconstitution. 2.5 ml of sterile preservative free normal saline was added to this vial and reconstituted. How many units of botox is present in 0.1 ml of the dilution? (ignore any volume changes during reconstitution)Calculate the volume of concentrated reagent required to prepare the dilutedsolutions indicated:a. 15 M NH3 to prepare 50 mL of 6.0 M NH3b. 18 M H2SO4 to prepare 250 mL of 10.0 M H2SO4