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Tris is widely used in a biochemical laboratory. Its acid dissociation constant is 8.32x10^-9. You have available at your lab bench a 0.1M solution of Tris in its protonated form, 0.1M solution of HCl and NaOH, and ample distilled water. Describe the preparation of a 1 L solution of 0.02M Tris buffer, pH=7.8.
calculate the weight of potassium chlorate required to prepare 380ml of wet oxygen collected over water at 20degrees
Explain for which of the following species resonance is an important property: HONO, HONO2, N3-, NO2-, NO2.
the structure they gave me already has two nonbonding electrons on Bromine with no formal charge
It has been observed that malonyl-CoA inhibits palmitic acid oxidation in isolated mitochondria, but that it has little or no effect on the oxidation of octanoic acid
Estimate the temperature at which calcium carbonate is likely to decomp under 1atm of pressure. Reaction: CaCO3(s) -> CaO(s) + CO2 (g) For this rxn: dHstandard = 177.8 kJ and dS standard= 160.5 J/K (notice unit differences)
A certain substance, intially present at 0.500 M, decomposes by second-order kinetics with a rate constant of 4.00 x 10-1 L/mol min. Calculate the time (in minutes) required for the system to reach a concentration of 0.370 M.
A gas expands and does P-V work on the surroundings equal to 325 J. At the same time, it absorbs 161 J of heat from the surroundings. Calculate the change in energy of the gas.
Calculate the volume of 1.00 M nitric acid needed to react completely with 25.0mL of 1.84 M calcium hydroxide
Calculate the partial pressure of each gas and the total pressure after the valve between the flasks is opened. P(He) in mmHg P(Ar) in mm Hg Ptotal in mm Hg
the solubility of o2 g in water at 25degc is 3.16 ml100 g h2o when the gas pressure is maintained at 1 atm. what
A sample of gas has a mass of 5.00 mg and occupies a volume of 4.13 mL at 23ºC and 745 torr. What is the molecular weight of the gas?
Consider 20.0 moles of CO2 in a 1.0 liter container at 300.0 K. What is the pressure predicted by the van der Waals equation.
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