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a. Assume a certain extraction has a distribution co-effecient of 7.5. The combination is made up of a certain quantity of caffeine dissolved in 100 ml of water. b. Re-crystallization was used to purify a 25 g organic compound. The amount recovered upon re-crystallization was 8 g. (Write the balancing equations for C,H, and O.:)
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- 1. You are given a substance that is equally soluble in water and hexane (two immiscible solvents). a) What is K,? b) If you start with 10 g of the substance dissolved in 100 ml of water and are given 100 ml of hexane to extract with, algebraically show that it is better to do two smaller extractions using 50 ml of hexane for each extraction than it is to do one extraction using 100 ml of hexane.A pharmacist was called for the assay of a newly delivered sodium chloride. Prior to the assay, he must prepare and standardize a solution of silver nitrate in the usual way. The weight of dried precipitate was determined as 0.581 grams. Calculate for the concentration of the solution in normality. 1. What is the molecular weight of the standard solution? 2. What is the molecular weight of the precipitate? 3. What is the computed normality of silver nitrate?9. An aqueous solution of sulfuric acid is prepared by mixing a secondary standard of sulfuric acid with deionized water. The aforementioned acid is to be used as a titrant hence its concentration must be accurately determined. To do this, Engr. Polinar, standardized the titrant by titrating two liters of ammonia at 0.90 atm and 30 deg C. From the experiment, 134 mL of the titrant was necessary to neutralize the ammonia. Determine the concentration of the acid in terms of normality? 10. Engr. Forcadela is optimizing a plastic formulation by manipulating the phosgene concentration injected as a gas during the reaction. To obtain credible results, he considered the propensity of phosgene to dissociate into carbon monoxide and chlorine gas at 395 deg C. Performing an experiment at the aforementioned temperature, an equilibrium is reached amongst the species where the total pressure is at 3 atm. If the equilibrium constant expression in terms of concentration for the reaction at 395 deg C…
- 2. What are the characteristics of an ideal precipitate? Using the Von Weirman ratio, explain the different methods that you can perform to make the precipitate more ideal?A mixture is 10.0 mole% Methyl alcohol, 75.0 mole% ethyl acetate, and 15.0 mole% acetic acid. Calculate: 1. Average molecular weight. 2. The mass fractions of each compound.A solution of Na,SO, in water is saturated at 50°C. When a saturated solution of Na,SO, is cooled, crystals of Na,SO4-10H2O separate from the solution Temperature, °C Solubility of Na,SO, g/100g water 49 50 46.7 10 9 If 1000 kg of this solution is cooled to 10°C, the percentage yield obtained is nearly а. 91 b. 90 с. 100 d. 80
- 10. A student analyzed a limestone sample but forgot to dry it. He found 31.20% CaO, whereas the correct value was 31.60. If the error was caused by the failure to dry the sample, what percentage moisture did the sample contain? 11. A 0.8000-g sample of iron ore containing 21.00% Fe is analyzed gravimetrically. If the final precipitate (assumed to be Fe,03) contains 20.0 mg of Al,O3 by mistake, what percentage of Fe does the analyst find?To improve the purity and filterability of a colloidal precipitate, the following procedures are used except Select one: a. Adding a strong volatile electrolyte b. Using dilute solutions c. Digestion Adding the precipitation agent quickly in a short time e. Stirring at elevated temperatures Ⓒd.Why a precipitate of manganese dioxide be removed from the potassium permaganate solution before standardization?
- Which is correct about the prereduction or preoxidation reagents a. Convert the titrant into desired form b. Totally convert analyte into desired form C. Should form a soluble product when react with analyte d. Be difficult to remove from the reaction mixture1. Which among these is/are desirable properties for the type of precipitate required in gravimetric analysis? I. large particles III. known composition A. I only II. reactive with atmospheric constituents IV. small particles C. I & III В. I & II D. III & IV Е. I, П, I17. This type of analysis implies that the constituent determined was present in very, very low concentration. a. Macro analysis b. Semi-macro analysis c. Micro analysis 18. Which of the following does not happen during digestion? The crystals dissolve and re-precipitate under equilibrium conditions. b. Weakly bound water are lost from the precipitates. c. Filterability improves d. None of the choices