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When 100 mL of an aqueous solution containing 1.0 g of caffeine is extracted with 10 mL of chloroform at room temperature, 0.5 g of caffeine is transferred to the chloroform layer. Calculate the distribution coefficient of caffeine between chloroform and water at room temperature.
what is the ph of a buffer prepared by adding 180 ml of 0.100 m naoh to 200 ml of 0.100 m acetic acid? ka for ch3cooh
Esters and amides can be most easily and conveniently prepared by nucleophilic acyl substitution reaction on
iron pyrite fes2 is the form in which much of the sulfur exists in coal. in the combustion ofcoal oxygen reacts with
Calculate the five points indicated in the experiment introduction and show these values in a small table along with one sample calculation.
a mixture conntains two compound that absorbs strongly in the 300-600nm range the molar absorptivities of the two compounds at two wavelenghts in this range are shown in the table compound molar absorptivity at 400 nm mola..
Titanium occurs in the magnetic mineral ilmenite (FeTiO3), which is often found mixed up with sand. The ilmenite can be separated from the sand with magnets. The titanium can then be extracted from the ilmenite by the following set of reactions
Calculate the resulting pH if 455 mL of 0.200 M HCl is mixed with 315 mL of 0.0850 M Ca(OH)2.
What is the molality of a solution that is composed of 265 g of acetone ((CH3)2CO) dissolved in 177 g of water.
The annual production of zinc sulfide (ZnS) is 4.5 104 tons. Estimate the number of tons of SO2 produced by roasting it to extract zinc metal
Dry ice, CO2 (s), has a melting temperature of -78o C and will not form a liquid unless atmospheric pressure exceeds 5.1 atm. The following reaction is conducted at -90o C and 101.325 kPa: CO2 (g) ? CO2 (s)
A three-step industrial process involves both heat and work. Calculate the overall change in energy DE for the entire process, given these three individual steps.
A researcher places 2 grams of lithium into a large beaker of water and catches the hydrogen gas being evolved. Since the water had a small drop of phenolphthalein indicator, the indicator turned a red color indicating that a base, lithium hydroxi..
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