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Calculate the ratio of dissolved benzioc acid to benzoate ion that will exist in solution at equilibrim at a pH of 2.00. The acid equilibrim constant (k) for benzoic acid is 6.46 X 10 ^5. Note that this calculatio doesn't account for the benzoic acid that has precipitated from solution, but you can assume that the higher the ration, the more benzoic acid will precipitate. Carry out same calculation for a pH of 4.00 and explain why it was important to reduce the pH to below 4 in this expirement.
We know Pro can interrupt an a-helix, chemically, do you think it will cause any unusual problems in the determination of, angiotension II sequences? Explain.
A gas occupies 4.04 L at 860 torr and 10C. What volume will it fill if the pressure is changed to 731 torr and the temperature is raised to 43C
Caffeine (C8H10N4O2) is a stimulant found in coffee and tea. If a solution of caffeine in chloroform (CHCl3) as a solvent has a concentration of 0.0870 m, calculate the following. (a) the percent caffeine by mass (b) the mole fraction of caffeine
the freezing point of the resulting solution is 3.77*C. The freezing point of pure benzine is 5.48*C. Calculate the molar mass of the compound.
One mole of CO29(g) is mixed with one mole of H2 (g) and passed over a catalyst for the following reaction: CO(g)+2H2(g)=CH3OH(g) At 500 K and a total pressure of 100 bar, 0.40 mol of CH3OH is gounf at equilibrium. What are the values of Kp and Kc?
You are concentrating a solution containing a polypeptide of modest molecular weight by pressure filtration through a membrane. The solute concentration on the feed side of the membrane is 0.10 M and the temperature is 25°C.
Write the formula of the compound that would be formed between these two elements: sodium and iodine; hydrogen and sulfur; aluminum and selenium.
the density of the compound as a gas was found to be 4.02g/L at 127 degrees C and 256 torr. What are the empirical and molecular formulas of the compound
What volumes of .50 M HNO2 and .50 M NaNO2 must be mixed to prepare 1.00 L of a solution buffered at pH= 3.55? Calculate the pH of solution formed by mixing 100 mL of .100 M NaF and 100 mL of .025 M HCl.
Balance the equation and answer in terms of moles.Chlorine gas can be produced commercially by passing an electric current through a concentrated solution of sodium chloride (brine).
Desalination of brackish water is achieved by evaporation. A fraction of feed water is sent through an evaporator and the other is bypassed. The fraction bypassed and the pure water leaving the evaporator are mixed together to give the desalinasie..
two allotropes of tin occur near room temp. the first form of tin is gray tin and is stable at temp. below 13.2
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