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The goal of the recrystallization procedure is to obtain purified material with a maximum recovery. For each of the following situations, explain why this goal would be adversely affected.
a) In the solution step, an unnecessarily large volume of solvent is used.
b) The crystals obtained after filtration are not washed with fresh cold solvent before drying.
c) The crystals obtained after filtration are washed with fresh hot solvent before drying.
d) A large quantity of decolorizing agent is used.
e) Crystals are obtained by breaking up the solidified mass of an oil that originally separated from the hot solution.
f) Crystallization is accelerated by placing the flask of hot solution in an ice-water bath.
Estimate the heat of formation of water dHf(H2O)(g) from its elements, provided the following bond energies. Write the equation.
The equation for the combustion of acetone is: 2 C3H6O + 8 O2 ---> 6 H2O + 6 CO2 + 852.6 kcal How much heat will be given off if 0.87 mol of acetone is completely burned?
When a glow stick is placed in a freezer, its chemiluminescence lasts a significant time longer. How might this come about?
What is the mass of a square piece of aluminum foil 100 micrometers thick and 10 cm wide? (Aluminum=2.7 g/cm^3)
A and B are two species which react in the presence of an acid catalyst. Would you expect the catalyst to appear in the rate law
The vapor pressure of water above this solution is found to be 0.3624 atm at 348.0 K. The vapor pressure of pure water at this temperature is 0.3804 atm.
Testing the run off water of PNA (polynuclear aromatic compounds). Which analytical method you will use in each case. Explain your choice
6.48g of NAH2PO4 and 21.96 g of K2HPO4 are dissolved in sufficent water to make a liter of solution. Caluclate the ph of the resulting solution.
Suppose that when you exercise, you consume 100 g of glucose and that all the energy released as heat remains in your body at 37 degrees Celsius. what is the change in entropy of your body
Select all the statements that correctly describe the relative rates of the reactions described below. (I) Sec-butyl bromide reacts faster than isobutyl bromide in aqueous formic acid.
Consider the following approximate figures relating to cigarette smoking and cancer. The death rate in the US population of 270 million is 15 deaths per 1000 persons per year. One-fifth of these deaths are from cancer and one-fourth of the cancer ..
Explain a compound has a molar mass of 598 g/mol. Define if 35.8 mg of the compound is dissolved in adequate water to make 175mL of solution at 25 0C, define what is the osmotic pressure of the resulting solution
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