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Tris is a commonly used buffer in biochemistry. It works well in the neutral to slightly basic pH range. A working solution of Tris?HCl buffer was made by mixing equal volumes of Tris base solution (made by dissolving 0.1454 g of Tris base in 50 mL of deionized water) with HCl solution (made by adding deionized water to 4 mL of 0.1 M HCl until the volume was 50 mL). The working buffer solution was warmed to 30 ?C and the pH of this solution was determined to be 8.03. What is the pKa of Tris under these conditions?
The sun produces energy via fusion. One of the fusion reactions that occurs in the sun is How much energy in joules is released by the fusion of 3.06 of hydrogen-1
a sample of molten iron occupies of a volume of 7.11 x 10-3 l. if the density of iron is 7.86 gcm3 what is the mass of
A current of 3.15 A is passed through a Pb(NO3)2 solution for 1.40 hours. How much lead is plated out of the solution.
Calculate the change in pH to 0.01 pH units caused by adding 10. mL of 2.63-M NaOH is added to 440. mL of each of the following
When ethyl benzoate is heated in methanol containing a small amount of HCl, methyl benzoate is formed. Draw structural formulas for the first two intermediates in this reaction.
Your friend decides to decrease cooking time for spaghetti noodles by adding table salt to 2.0 L water. How much table salt (NaCl) must be added to the water in order to raise the boiling point by 4.0?C? (Kf = 1.86?C/m, Kb = 0.512?C/m)
The extent of fragmentation for ionic compounds can be derived by comparing the molality expected if no dissociation with what is actually obtained from experiment.
The resulting solution has an osmotic pressure of 0.605 atm at 25 C. Assuming that the organic compound is a non-electrolyte, what is its molar mass
What mass of helium gas is needed to pressurize a 112.0 L tank to 262 atm at 25°C?
Calculate the volume of 0.07216 M AgNO3 needed to react exactly with 0.3572 g of pure Na2Co3 to
Identify invent a salt which has a weak acid as it's cation and a weak base as its anion so that the salt would yield an acidic solution in water.
A thief uses a bag of sand to replace a gold statue that sits on a weight sensitive, alarmed pedestal. The bag of sand and the statue have exactly the same volume, 1.70L. (assume that the mass of the bag is negligible.)
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