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Describe how you would purify p-nitrobenzoic acid from a mixture of a 9.0 g of p-nitrobenzoic acid and 2.0 g of o-nitrobenzoic acid using recrystallization. Tell which solvents you would use and how the components would get separated.
A solution of ammonia and water contains 3.00×1025 water molecules and 5.10×1024 ammonia molecules. How many total hydrogen atoms are in this solution?
A bottle contains 175 m: of insulin at a concentration of 20.0 mg/ml . What is the total mass of insulin in the bottle?
Calculate the ion mobility of 100nt long DNA molecules and single nucleotide molecules. Correlate this to the conductivity of the solution.
If emitted particles with a given diameter are found to settle out after 7 days, how long would it take a particle of the same material with 1x the diameter to settle out?
Explain why is that based on your understanding of the forces that maintain the native conformation of proteins.
It is common to see the the strength of aspirin tablets listed in terms of the number of grains of ASA per tablet. using the conversion factor of 15.4 grains per gram ASA,
An aqueous solution containing 34.1 g of an unknown molecular (nonelectrolyte) compound in 141.3 g of water was found to have a freezing point of -1.5 degrees C. Calculate the molar mass of the unknown compound.
A 0.150 M aqueous solution of the weak inorganic acid HA was prepared from the pure compound, and three 50.0 mL aliquots were transferred to 100.0 mL volumetric flasks.
The temperature in the laboratory was 23°C and the barometric pressure was 621. mm Hg. You will need to look up vapor pressure of water at that temperature. Find the equivalent mass of this metal.
account for each of the following properties of solids: the definite volume, the relatively high density of solids, the extremely low rate of diffusion.
A gas expands and does P-V work on the surroundings equal to 285 J. At the same time, it absorbs 216 J of heat from the surroundings. What is the change in energy of the system?
Then rotovap until crystallized and add 20 mL cold H2O, stir +10% HCl to neutralize. Filter and wash.
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