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A sample of naphthalene, which should be pure white, was found to have a grayish color after the usual purification procedure. The melting point was correct, and the melting point range was small. Explain the gray color.
Each was extracted with three 5-mL aliquots of CCl4 containing an excess of 8-hydroxyquinoline. The extracts were diluted to 25 mL and their fluorescence was measured. What is the concentration of the zinc in the unknown solution?
For the equalibrium PCl5(g) PCl3(g) + Cl2(g), Kc= 2.0 x 10^1 at240 celcius. If pure PCl5 is placed in a 1.00-l container and allowed to come to equalibrium, and the equalibrium concentration of PCl3(g) is 0.23 M, what is the equalibrium concentr..
Calculate the approximate molecular mass of an unknown protein which had an elution volume of 9.0mL on the column.
What is the pH of a solution resulting from the titration of 50 mL of 0.050 M formic acid solution, HCOOH, with 25 mL of 0.050 M NaOH solution? Calculate your answer to two decimal places.
a sample of a certain beverage contains 1.00g of tartaric acid, H2C4H4O6. The beverage is titrated with 0.100M NaOH, how many millimeters of base are required to neutralize the tartaric acid.
According to the data, what is the value of delta H for the reaction.
what is the balanced equation of the ostwald process and is it exothermic or
some liquids have high enthalpies of vaporization while others have relatively low values. explain this fact in terms
A 486 mL sample of water was cooled from 50.0°C to 10.0°C. Assuming a specific heat of 4.184 J/K g and a density of 1.00 g/mL, find the amount of heat transferred from the water to the surroundings.
the carbon-14 decay rate of a sample obtained from a young tree is 0.238 disintegration per second per gram of the
data below show equilibrium constant for this reaction meassured at several different temperature. use data to find dHrxn and dHSrxn for reaction
The standard deviation is 50768, and the RSD % is 12.4%. The original mass of the tablet was 679.1 milligrams. How do I find how many milligrams of caffeine was in the original tablet
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