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Problem- Nitration of phenol: Purification of products (from crude product mixture) step: why do we use 60:40 dichloromethane/hexane solvent mixture to separate 2-nitrophenol and 50:50 dichloromethane /ethylacetate solvent mixture to separate 4-nitrophenol? What is the role of each sovent mixture and its impact on the crude product mixture?
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Write simplified expressions in terms of [H+] and Kas and (with insignificant terms removed) for the alpha fractions of the following species of glutamic acid
Write an equilibrium expression for each chemical equation. 1. 2CO(g)+O2(g)===2CO2(g) 2. N2(g)+O2(g)===2NO(g) 3. SbCl5(g)===SbCl3(g)+Cl2(g) 4. CO(g)+Cl2(g)===COCl2(g)
Calculate the ratio of ionized to unionized drug forms that would exist in the plasma at physiological pH (7.4). What is the percent ionized to unionized
A 13.6 g of copper at 90.5 degrees celsius is dropped into 150.0g of water at 20.0 degrees celsius. The specific heat of copper is 0.385 J/g.K
The standard molar enthalpy of formation of ClF3 is -405 kJ. 1/2 Cl2(g) + 3/2 F2(g) → ClF3(g)
Calculate the freezing point of an aqueous solution formed by dissolving 4.22 g of KCl in 25.00 mL of water. Kf for water is -1.86 degrees C/m. Assume the density of water
Iron and vanadium both have the BCC crystal structure, and V forms a substitutional solid structure in Fe for concentrations up to approximately 20 wt% V at room temperature.
What was the pH of the original benzoic acid solution. What are the concentrations of all of the following ions at the equivalence point
The amount of isotope reduces in a first-order process. If 19.0% of the original amount of 14C is present in a wooden tool at the time of analysis, explain what is the age of the tool. The half-life of 14C is 5730 yr.
Explain an air bubble accidentally enters the CO2-collection graduated cylinder after the completion of a reaction. Explain how does the error affect the reported moles of CO2(g) collected. Why
What are the characteristic absorption regions for a) carbonyl groups and b) alcohols (RO-H), Are these absorptions a result of stretching vibrations or bending vibrations
Find the mass of urea needed to prepare 50.7 of a solution in water in which the mole fraction of urea is 7.53×10-2.
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