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A base-base extraction was done using 0.4g of a mixed compound at ratio 1:2:1 of benzoic acid, 2-napthol, napthalene that was dissolved in diethyl ether. NaHCO3 was added, shaken, and then separated off using a funnel and saved. Cold NaOH was added, shaken, funneled off, and then saved. The remaining organic layer was then funneled off, saved, and dryed. The NaHCO3 and NaOH fractions were made acidic with additions of HCl, then vacuum dried via buchner funnel. Neutral fraction was dryed via reduced pressure. All samples were then weighed for recovery and melting points were measured. What modifications if any would have to be done to the procedure if the experiment were repeated using dichloromethane instead of diethylether? Which parts would be affected and why?
If you prepare a liter of 0.02 M acetic acid and 0.01 M sodium acetate, what will be the pH if the pKa of acetic acid is 4.76? b) If you add 1 ml of 5 M NaOH to the 1 liter above, what will be the new pH and the change in pH?
In a particular solution, [Cr3+]=3.9x10-4 mol/L. What is the minimum pH at which Cr(OH)3(s) will precipitate from this solution. Assume the temperature is 25oC. For Cr(OH)3(s), Ksp=6.3x10-31 at 25oC. Give your answer with three digits
why are elements such as Hg, As, Bi, Sb and others first converted to their hydrides prior to sample analysis by Atomic Absorption Spectroscopy?
it is found that 1.431 g of element x contains 7.509 times 1021 atoms. the atomic mass of x is? how many protons does
The decomposition of hydrogen is a first order reaction with a rate constant of 2.7 x 10^5s^-1 at 25 C. Assuming the initial concentration of H2O2 is 0.75 M. Determine (a) the concentration of H2O2 after 1.5 h, and (b) the time (in h) or the conce..
How to do I calculate the pH of original buffer given mass of NaC2H3O2*H2O (FW =136 g/mol) = 3.507 g
Describe a spectrum absorbance vs. frequency corresponding to the transitions you have shown in part a. Indicate which transitions in the energy level diagram correspond to which peaks in the spectrum.
a flammable gas made up only of carbon and hydrogen is found to effuse through a small hole in 1.50 min. under the same
Problem- a 2.50-g sample of calcium metal is heated in a 38.500-g crucible to form a calcium oxide. if the crucible and product weigh 38.850 g, what is the empirical formula for calcium oxide
considering the given equation as al2o3s rarr 4 als 3 o2g . where ?h 3339.6 kjmol determine ?h for the formation of
A tank with a flat bottom of area A and vertical sides is filled to a depth h with water. The top of the water is at atmospheric pressure. (a) What is the absolute pressure at the bottom of the tank. (b) How high could a faucet be placed before no..
A one-mole sample of a monatomic perfect gas with a constant pressure heat capacity of 20.85 J/(K mol) is initially at a pressure of 3.25 bar at 200 K. It undergoes an adiabatic reversible expansion until its pressure is 1.52 bar. Calculate: q, w,..
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