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These questions is regard to the accompany the stereoselective Wittig reaction. A) The procedure calls for the addition of 7-8 drops of aqueous NaOH. What is the purpose of the base here? Be specific and show the reaction that occurs. B) Why the switch in drying agents? Anhydrous sodium sulfate is both efficient and inexpensive. Potassium carbonate is less efficient and somewhat more costly. *Hint: Sodium sulfate is actually a wee bit acidic whereas potassium carbonate is a bit basic! Your product is an alkene. C) The mass of your crude product (as well as the tlc) should clue you in that an impurity if present. Whatever it is must also be soluble in dichloromethane, right? What is the probable identity of this impurity? At what point is it being removed?
In a gas mixture the partial pressures are nitrogen 425 torr, oxigen 115 torr, and hellium 225 torr. What is the total pressure (atm) exerted by the gas mixture?
Extracting aluminium uses a current of 25000 ampere.What is the time taken to produce 10kg of aluminium from Al2O3(liquid
find the specific solubilities (in g/100g H2O) in both cold and hot water for AgCl, PbCl2, and Hg2Cl2.
What is ozone and how it works as a protective molecule for our environment? What are the effects of CFCs on the ozone layer.
Determine the molarity of a solution that is formed by dissolving 21.0 g of CaF2 in a flask and adding water to make 446.2 mL of solution
If 1.500 g of a solute having a molar mass of 125.0 g were dissolved in 35.00g of camphor, what would be the resulting freezing point of the solution.
Glucose is pumped into some animal cells by a symporter powered by simultaneous entry of Na+. The entry of Na+ provides a free-energy input of 10.8 kJ/mol under typical cellular conditions (external [Na+] = 143 mM, internal [Na+] =14 mM
The [H3O+] is 1*10-6M in a solution. Calculate the [OH-]
Graphite is a semi-metal composed of sheets of fused benzene rings. There are no bonds between sheets, only van der Waals interactions
25.00 mL of 0.25 M formic acid is titrated with 25.00 mL of .2500 M NaOh. What is the pH at the equivalence point?
A gaseous mixture of O2 and Kr has a density of 1.140 g/L at 415 torr and 300. K. What is the mole percent O2 in the mixture?
A chemist wants to make 5.5L of a 0.280M CaCl2 solution. What mass of CaCl2 (in g ) should the chemist use?
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