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Which of the following accurately corresponds to the composition of the
precipitate obtained from a mixture of proteins A and B (properties below) by
employing the specified (NH4)2SO4 concentration assuming the salt is added in
bulk i.e. one step?
| Protein % | (NH4)2SO4 to precipitate |
| A | 40 |
| B | 70 |
a. At 30% (NH4)2SO4 : A
b. At 40% (NH4)2SO4 : B
c. At 60% (NH4)2SO4 : A
d. At 70% (NH4)2SO4 : B
e. None of the above
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- 0.1 g of the mixture of na2so4 and k2so4 is taken and 100 ml of solution is prepared. 10 ml of this prepared solution is placed in a beaker and some distilled water is added. A mass of 15.5 mg is obtained by precipitation with Bacl2 at PH=5, then filtering and bringing to a constant weight at 800 °C. Calculate the percentages of Na2so4 and K2so4 in the mixture accordingly.Q1. Dissolved 0.273 grams of pure sodium oxalate (Na2C0.) In distilled water and added sulfuric acid and titration the solution at 70 ° C by using 42.68 ml of KMnO, solution and has exceeded end point limits by using 1.46 ml of oxalic acid (H , C, 0.) With 0.1024 N. Calculate the normlity of KMnO .. Note that the molecular weight of sodium oxalate (Na, C, 0.) = 134 and its equivalent weight = 67Dissolved 0.273 grams of pure sodium oxalate (Na2C204) in distilled water and added sulfuric acid and titration the solution at 70 °C by using 42.68 ml of KMNO4 solution and has exceeded end point limits by using 1.46 ml of standard oxalic acid (H2 C204) with 0.1024 N. Calculate the normlity of KMNO4. Note that the molecular weight of sodium oxalate (Na2C204) = 134 and its equivalent weight = 67 * %3D
- Dissolved 0.273 grams of pure sodium oxalate (Na2C204) in distilled water and added sulfuric acid and titration the solution at 70 ' C by using 42.68 ml of KMn04 solution and has exceeded end point limits by using 1.46 ml of standard oxalic acid (H2 C204) with 0.1024 N. Calculate the normlity of KMn04. Note that the molecular weight of sodium oxalate (Na2C204) 134 and its equivalent weight ; 67 *You are given a substance that is qually soluble in water and hexane (two immisible solvents) a) what is Kd B) if you start with 10g of the substance dissolved in 100ml of water and are given 100ml of hexane to extract with, algebriaically 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 100ml of hexaneCalculate the mole fractions of SO2•H2O, HSO3- and SO3 2- in solution at a pH of 3.0, characteristic of many fogs, as well as the total concentration of S(IV) in solution for 20 ppb SO2 in the gas phase. Constants attached in table
- Hexanoic acid was added to an immiscible biphasic solvent sysem, water and CCl4 at 20.0OC and the equilibrium concentrations of hexanoic acid were determined to be 3.66 g/L in H2O and 67.0 g/L in CCl4. Caluclate the distrubution coeffiecent (D1) of hexanoic acid in CCl4 with respect to water.FeCl3 and MgCl2 solution was prepared by dissolving FeCl3 (AR) and MgCl2 (AR) in distilled water. Secondly, under rapid stirring, NaHCO3 powder was slowly added to the above solution to the desired basicity (B = 1) which had been proved to be the optimal B for turbidity removal. Thirdly, Na2HPO4 (AR) was added to the PFMC solution as a stabilizer ([Na2HPO4]/([Fe] + [Mg]) = 0.08). i. The the chemical equation of the Synthesis. ii How much weight need to put NaHCO3 above solution the desired basicity (B=1) iii. How much weight need to put Na2HPO4 on PFMC solution refering ([Na2HPO4]/([Fe] + [Mg]) = 0.08).Which of the following methods of preparing 0.0010M HCl solution from 1.0M stock HCl Solution willyield the smaller overlall uncertainty? a. A one step Dilution that uses 1mL(±0.006) pipet and 1000mL(±0.30) Volumetric Flask, or b. A two-step dilution that uses 20mL (±0.03) pipet and a 1000mL(±0.30) volumetric flask and a25 mL (±0.03) pipet and a 500mL(±0.20) volumetric flask for second dilution.
- 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 __(1a) Pure benzophenane freezes at 66.6 °C. A solution of 7.75 g of biphenyl (C12H10; molar mass = 154.2g/mol) plus 200.08 g of benzophenane froze at 59.9 °C. Calculate the Kf of benzophenane in °C*kg/mol. (b) An unknown solution with possible cations (Ag+, Hg22+, Pb2+) is treated with 6M HCl and a white precipitate forms. Hot water is added to the precipitate, and a white solid remains after filtration. The white solid is treated with aqueous NH3, and the precipitate turns grey or black. The resulting solution is treated with HNO3 and no precipitate forms. What cations can you determine to be present, absent or maybe present? Explain your reasonCalculate the gravimetric factor of the following. 2 Fe3O4 is sought(Analyte), 3 Fe2O3 is weighed (Precipitate)
