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0.070 g of caffeine is dissolved in 4.0mL of water. the caffeine is extracted from the aqueous solution three times with 2.0mL portions of methylene chloride. Calculate the total amount of caffeine that can be extracted into three portions of methylene chloride. Caffeine has a distribution coefficient of 4.6, between methylene chloride and water.
what is the difference of the KBR specrtum in % transmittance and absorbance. and btw wavenumber and wavelength
Assuming that the water is contaminated, devise a method for disposing of the contaminated water without contaminating the environment, but allowing the recycling plant to resume operations as soon as possible.
What would the change in temperature be in each change if 1 mole of an ideal gas is subjected to numerous changes in state, C= 12.47 J/Kmol.?
A solution containing 3.47mM X (analyte) and 1.72 mM S (standard) gave peak areas of 3473 and 10222, respectively, in a chromatographic analysis. Then 1.00ml of 8.47mM S was added to 5.00ml of unknown X, and the mixture was diluted to 10.0ml. This..
When pure carbon burns in air, 10.0 kg of carbon react with the oxygen in the air to form 36.7 kg of carbon dioxide. Calculate the percentage of oxygen contained in carbon dioxide.
a flask contains 30mL of 0.16 M phosphate buffer that has a pH of 7.1. what volume of 0.06M NaOH should be added to increase
considering the energetics of change of H and change of S values of solute/solvent interation, solvent/solbent interactions and aolut/solvent interactions
Hydrogen atoms are excited by a laser to the n=4 state and then allowed to emit. What is the maximum number of distinct emission spectral lines that can be observed from this system? Calculate the wavelength of the 4 to 1 transition in m.
An ascorbic acid supplement was analyzed by titrating a 0.1000g sample dissolved in water with 0.0200M NaOH. A volume of 15.20 mL of the base was required to completely neutralized the ascorbic acid. What was the percentage by mass of ascorbic aci..
Which indicator would be the best to use when titrating ammonia with nitric acid? Kb of NH3 is 1.8 x 10-5.
Are the following reactions spontaneous, non-spontaneous, or not possible?
Write a balanced equation for the decomposition reaction described, using the smallest possible integer coefficients. When calcium carbonate decomposes, calcium oxide and carbon dioxide are formed.
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