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A weak organic acid (pKa = 4.82) is being studied as a potential broadleaf herbicide. One aspect of the study includes testing for its presence in water samples taken from a run-off of a field.
The acid has a distribution ratio of 62 between water and chloroform at a pH of 3.42.
a. Using 30.0 mL of chloroform, what fraction of the compound will be extracted from a 50.0 mL field sample at pH = 3.42?
b. What fraction of the acid in the 50.0 mL sample would be extracted, again at pH 3.42, using three 10.0 mL portions of chloroform?
c. If the pH of the solution was changed to 6.00, what fraction would be extracted using 30.0 mL of chloroform with a 50.0 mL field sample?
d. Qualitatively, predict what effect a lower pH would have on the extraction.
The half-life of plutonium-239 is 24 110 yrs. Of an original mass of 100.g, how much plutonium-239 remains after 96 440 yrs?
Cholesterol is a compound suspected of causing hardening of the arteries. A 5.02 g sample of cholesterol was analyzed, and the following data was obtained
The cell potential of the following electrochemical cell depends on the gold concentration in the cathode half-cell: Pt(s) | H2(g,1atm) | H+(aq,1.0M) | Au3+(aq,?M)|Au(s).
explain why the coupling of the diazonium salt with a phenol or an aromatic amine occurs at the para position.
The initial rate of a reaction 2A + 3B -> C + 2D was measured using different initial concentrations of A and B. Calculate the value of k
Gas x effuses 0.629 times as far as oxygen under the same conditions. what is the molar mass of gas x.
A gas has a volume of 10 L at 0 degrees C. What is the final temperature of the gas in C if its volume increases to 27 L? Assume that amount of the gas and its pressure remain unchanged.
A student determined the Kf (f as lower subscript) of t-butyl alcohol using tap water instead of distilled or deionized water. Describe the problems that might have been encountered. How would these problems affect the magnitude of Kf?
Calculate the molar solubility of AgBr in a 1.00 M aqueous solution of ammonia. Then calculate the solubility of AgBr in pure water, and compare the two solubilities. (Ksp for silver bromide is 7.7x10 -13 and Kf for Ag(NH3)2+ is 1.6x10^7)
Dr. Carvell made up a 5X stock of ONPG stock solution that has a concentration of 50 mN. The molecular mass of ONPG is 354.7. What is the percent composition of this solution
A 0.0100 molal aqueous solution of a weak acid freezes at -0.0219 oC. Calculate the percent ionization of the weak acid, HA.
477 j amount energy is added to a 74.0 grams sample of h2o at a temperature of 21 degree celsius. determine what will
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