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To recrystallize a solid, the solvent used must dissolve very little solid when cold and a lot of solid when hot. Explain why thesolid should dissolve very little when the solvent is cold. Also give the reason why the hot solvent must dissolve a lot of the solid?
solution of ephedrine was determined with a pH meter andwas found to be 10.70. Calculate the pKb for ephedrine.
Effusion describes, A) the process by which a gas spreads out through another gas B) the process that describes the collisiions that occur between gas molecules
what concentration in ppm would it constitute? The effective volume of the earth's atmosphere is about 4.2 billion km^3, and take the average pressure to be 550 mm Hg and the average temperature to be -10 degrees C. The molar mass of air is 29 g/m..
IF the benzene ring has two halides i.e chlorine and bromine and we do dow process, which halide will it pick. The question looks something liike this
Chromic acid is a diprotic acid H2CrO4 with Ka1 = 0.18 and Ka2 = 3.2 x 10-7. A solution of potassium chromate is prepared at pH 5.43. Calculate the fraction of the total chromate in this solution that is present as the chromate ion CrO42-.
The half life for the first order decay of 99Mo is 66.02 hours. How long will it take for a sample of 99Mo to decay
the lambda max for one Cu2+ complex ion is longer than the lambda max for a second Cu2+ complex ion, is the coordinate covalent bonding between ligands and Cu2+ stronger in the first or second complex? Briefly explain.
what volume is occupied by 1.00kg of oxygen gas at 5.00 degrees Celsius at a pressure of 735 torr
The solubility product constant for Ce(IO3)3 is 3.2 *10 ^-10, What is the Ce3+ concentration in a solution prepared by mixing 50.0 mL of 0.250 M Ce 3+ with 50.0 mL of 0.040 M IO3^-?
Draw the structures of the two carbocation intermediates that might form during the reaction of the alkene (below) with HCl. If the two carbocations differ in stability, draw a reaction arrow from the less stable to the more stable.
Ammonia and oxygen react to form nitrogen and water. How many grams of N2 can be produced when 6.30g O2 reacts?
What is the mass of H2SO4 in a 48.4-cm3 sample of sulfuric acid that has a density of 1.52 g.cm-3 and which consists of 55.2% H2SO4
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