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Q1. An enzyme catalysed reaction was carried out in 0.2M Tris buffer ,PH 7.8.As a result of the reaction, 0.03 M H+ was produced. (a) what was the ratio of Tris+(acid) to Tris 0(conjugate base) and hence the concentrations of these at the start of the reaction?(b)what were the concentrations of the Tris+/Tris0 at the end of the reaction? (c)what was the PH at the end of the reaction? (d)what would the final pH be if no buffer was present? will the enzyme survive at this pH?
Q2. The PH of gastric juice in the stomach is about 1 and the PH of the small intestines is about 6.For a drug to be absorbed into the blood stream, it needs to pass through a non polar lipid bilayer of the cell, lining the stomach and small intestines. Will more aspirin, be absorbed into the blood stream from the stomach or intestines? clearly justify your reasoning. pKa=3.5
4 NH3(g) + 5 O2(g) → 4 NO(g) + 6 H2O(g) In a certain experiment, 4.30 g of NH3 reacts with 7.48 g of O2. Which is the limiting reactant?
An environmental engineer analyzes a sample of air contaminated with sulfur dioxide. To a 500m mL sample of air at 700 torr and 38 degrees celsius, she adds 20.00 mL of 0.01017 M aqueous iodine, which reacts as follows
Calculate the molar solubility of barium sulfate a) in water, and b), in a solution containing 0.60 M of sodium sulfate.
Problem- What volume of 0.248M CaCl2 must be added to 340mL of 0.180M KCl to produce a solution with a concentration of 0.230M Cl-
Suppose that coal of density 1.5 g/cm3 is pure carbon. (It is, in fact, much more com- plicated, but this is a reasonable ?rst ap proximation.)
Calculate the molar mass that would be obtained from the actual experimental data under the following conditions. The unknown is methyl propyl ether (CH3OC3H7)
Find the lowest temperature of vaporization and the highest temperature when there is liquid left over and Determine the range of temperatures which could be used for this process.
Explain why the optically pure ketone (R) 3-methyl-2-hexanone gives a racemic mixture when exposed briefly to aqueous acid, whereas (R) 3-methyl-3-ethyl-2-hexanone remains optically pure under the same conditions.
Air has a density of about 1.2 kg/m3. One standard atmosphere (1 atm) is about 105 Pa. Assuming that the density of air remained constant as altitude increased, how high would the Earth's atmosphere have be to create a pressure of 1 atm
What is the molarity of a solution made with 2.4g of LiOH (molar mass=23.9g/mol) dissolved to make 1.5L of solution
Calculate the viscosity average and number average molecular weights of polyvinyl alcohol given the molar mass of cleaved and uncleaved polymer solution.
a fuel gas containing methane and ethane is burned with air infurnace producing a stack gas at 300c and 105kpaabsolute.
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