Description You have 75 mL of a 2.5 M solution of Na2CrO4(aq). You also have 125 mL of a 2.01 M solution of AgNO3(aq). Calculate the concentration of CrO4^2- after the two solutions are mixed together.
Description 1) Ibuprofen has a carboxylic acid functionality and has a pKa of 4.43. Aspirin has a carboxylic acid functionality and has a pKa of 3.50. Acetaminophen has a phenol functionality and has a pKa of 9.51. You will need the following information: The pKa of HCl is –7; pKa of carbonic acid is 6.52 and the pKa of water is 15. a) You have a mixture of ibuprofen and aspirin that you wish to separate by extraction. The mixture is dissolved in methylene chloride. Would reacting the mixture with an aqueous solution of NaOH separate one substance from the other? Why or why not? b) You have a mixture of ibuprofen and acetaminophen that you wish to separate by extraction. The mixture is dissolved in methylene chloride. i) Which among HCl, sodium bicarbonate and sodium hydroxide solutions would you use to separate the two substances? ii) Why can you not use the other two options from above to effect the separation (explain what would happen if you did).
Description 2) The distribution coefficient between methylene chloride and water for solute Y is 12. An amount of 102.0 g of Y is dissolved in 120 mL of water. a) What weight of Y would be removed from water with a single extraction with 120-mL of methylene chloride? Report to 1 decimal place. (show calculations) b) What weight of Y would be removed from water (the original solution) with two successive extractions with 60-mL portions each of methylene chloride? Report to 1 decimal place. (show calculations) 3) You have 91.0 g of solute Q dissolved in 140-mL of water. The distribution coefficient between ether and water for solute Q is 10. What volume of ether would you need to extract 80.0 g of solute Q in one extraction from the original 91.0g dissolved in 140 mL water? Provide answer to closest mL. (Show calculations)
Description A photoelectric experiment was preformed by separately shining a laser at 450nm (blue light) and a laser at 560nm (yellow light) on a clean metal surface and measuring the # of electrons ejected. Which light would generate more electrons? Which light would eject electrons with more kinetic energy?
Description All low-level waste disposal sites use a series of natural and engineered barriers to prevent radioactivity from reaching the biosphere. True or false
Description LD50 is lethal dosage. QUESTION: Assuming that these compounds are similarly toxic to humans, how much of each compound would be required to reach the LD50 for a 150 pound human? Show your calculations. Which of the two compounds is more toxic? How can you tell? (2pts)
