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- Explain what happened to the salt (the inorganic impurity) during the extraction process. Where does it go and why?8. If a mixture of the four compounds shown below are placed on the top of a silica gel column and eluted properly, what is the expected order of elution? Оон A CO₂H B CIAdditives that may be included in the mobile phase for SEC hexane Salts Detergents Urea
- An impure sample containing 2.00 g of sodium carbonate and bicarbonate was taken. It was dissolved in water and then crushed with hydrochloric acid (0.1 N). If the burette reading was at the end point of the phenolphthalein 7.5 ml and at the end of the orange methyl point was 20.0 ml. Calculate the ratio The percentage of sodium bicarbonate in the sample. Note that the molecular weight of sodium bicarbonate is 84 *Why does vanadium pentaoxide acts a catalyst?The thiourea in a 1.455 g sample of organic material was extracted into a dilute sulfuric acid solution and titrated with 37.31 mL of 0.009372 M Hg2+ via reaction: 4(NH2)2CS + Hg2+ →[(NH2)2CS]4 Hg2+
- Based from the given problem, What is the molecular weight and meq of potassium biphthalate (C8H5KO4)?See image belowThe thiourea in a 1.455-g sample of organic material was extracted into a dilute H2SO4 solution and titrated with 37.31 mL of 0.009372 M Hg2+ via the reaction. Calculate the percent (NH2)2CS (76.12 g/mol) in the sample. 4 (NH2)2CS + Hg2+ → [(NH2)2CS]4Hg2+
- What are the important solubility characteristics for a solvent for crystallization of an organic solid that is contaminated with a small amount of impurity?What is deliquescent salt?In a reaction involving the iodination of acetone, the following volumes were used to make up the reaction mixture: 5mL4.0M acetone+10mL1.0M HCl+10mL0.0050MI2+25mLH2O a. How many moles of acetone were in the reaction mixture? Recall that, for a component A, moles A=MAV, where MA is the molarity of A and V is the volume in liters of the solution of A that was used. __________ moles acetone b. What was the molarity of acetone in the reaction mixture? The volume of the mixture was 50 mL, 0.050 L, and the number of moles of acetone was found in Part a. Again, MA=moles ofAV of soln. in liters __________ M acetone c. How could you double the molarity of the acetone in the reaction mixture, keeping the total volume at 50 mL and keeping the same concentrations of H+ ion and I2 as in the original mixture?
