in acid base extraction if you start with 1.25 g of mixture and recover 0.45 g of organic acid, 0.38g of organic base and 0.35g of neutral compound, calculate the % recovery. Write the formula and final answer.
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- The stock erythrosine B solution is 8.5 × 10-5 M. Calculate the volume of this solution that you must pipet into a 50-mL volumetric flask, which, when diluted to mark with deionized water, will give a final concentration of 1.7 × 10-5 M. Show your calculation setup.The first goal is to make the oxalic acid standard solution. You measure 1.5232 g of oxalic acid on an analytical balance, add it to a 250-mL volumetric flask and add deionized H2O to a final volume of 250.0 mL. Molar mass of H2C2O4•2H2O = 126.07 g/mol Mass of H2C2O4•2H2O = 1.5232g Volume of H2C2O4•2H2O solution = 250.0mL What is the Molarity H2C2O4 standard solution ?You are performing an extraction and you begin with 0.70 g of crude starting material. At the conclusion of this exercise, you isolate 0.52 g of pure product. Calculate a percent recovery?
- A 30-gram soil sample was leached with excess 1N solution of ammonium acetate and was later found that it can hold 0.096g of NH4+. What is the CEC of the soil in me/100g?The first goal is to make the oxalic acid standard solution. You measure 1.5232 g of oxalic acid on an analytical balance, add it to a 250-mL volumetric flask and add deionized H2O to a final volume of 250.0 mL. Molar mass of H2C2O4•2H2O = 126.07 g/mol Mass of H2C2O4•2H2O = 1.5232g what is the Number of moles of H2C2O4•2H2O?Calculate the mass percent of the ascorbic acid in the same show full solution Situation: The pounded Vitamin C tablet was half into two below are the calculated data in the experiment. Each of the half are transfered in a 250ml erlen meyer flask and added 75ml of deionized water for the vitamin C to dissolve. Then it was prepared for titration where the burette was filled with 0.09794M standardize NaOH solution then a total of with 3 drops 2% phenolphthalein indicator was added to each erlen meyer flask l, swrill it and begin the titration. below are the following data gathered: Vitamins used: Nature Made vitamin C 500mg tablet Trial 1 Mass: 0.3108g of Vitamin C tablet Initial volume: 1.6mL Final volume: 15.4mL Trial 2 Mass: 0.3349g Initial volume: 15.4 mL Final volume: 30.2 mL
- A weight of 0.50 g was taken impure container containing sodium carbonate and bicarbonate. Dissolved in water and then crushed with hydrochloric acid (0.1 N), the burette reading game was at the endpoint of phenolphthalein of 10.5 ml and at the end point of the orange methylation point 30.1 ml. The percentage of sodium carbonate was in ................. knowing that the weights are: Na: 23, C: 12, O: 16If the solubility of a compound A in ether is 30g/100 ml, and the solubility of A in water is 15 g /100 ml. a) If 100 ml of aqueous solution of 3g of A are extracted twice with 100 ml ether. How much A total is extracted? b) How much A would be extracted if only one extraction, but with a volume of 200 ml of ether were extracted? c) What is your conclusion from the amount of A extracted in problems a and b above?B. Determining the Composition of a Mixture of Sodium Chloride and Sodium Nitrate Partner I Prepare a solution of sodium chloride + sodium nitrate and indicator. Obtain a dropper bottle of potassium chromate (indicator) solution. To a clean and dry 125 mL Erlenmeyer flask, add about 40 mL of water and 8 drops of indicator solution. Weigh out approximately 0.05 grams of sodium chloride + sodium nitrate solid and record its exact mass. Dissolve the solid in the solution from step 1, stirring with a stirring rod to ensure complete dissolution. Determine and record the total mass of the Erlenmeyer flask and solution, noting the balance that you use to weigh. Rather than measuring the volume of silver nitrate solution added as in Part A, we will measure the mass of titrant added and make use of the weight-percentage concentration of silver nitrate in calculations. Prepare the silver nitrate solution. Obtain about 15 mL of 1.70% w/w silver nitrate solution in a 50 mL beaker. Designate a…
- 2.1g of sample are dissolved in methylene chloride and the sample is extracted with aqueous solutions of acid and base. Three compounds are isolated - 0.8g of ethyl p-aminobenzoate, 0.6 g of acetanilide, and 0.5 g of benzoic acid. Calculate the % recovery for the procedure. (Round the answer to the nearest tens place.) Give just the number, not a % sign.)Find the molarity of acetic acid prepared by diluting 34.9 mL of concentrated (glacial, 17.4 M) acetic acid in a total volume of 50.00 mL. answer in decimal format to the correct number of sig. figs.What should be done if the percent recovery is greater than 100%? Should the recrystallization process be done again? and from start?
