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What is the hydronium-ion concentration of a buffer solution that is .25 M Na2HPO4 and .40 M NaH2PO4? For H3PO4, (Ka1=6.9x10-3), (Ka2=6.2x10-8) and (Ka3=4.8x10-13).
2.20g of solid NaOH are added to 250ml of 0.10M FeCl2 solution. Given that Ksp for Fe(OH)2 is 1.6x10^14, calculate the following. The weight of Fe(OH)2 formed
1. Consider treating polyenes, ethylene, butadiene, hexatriene, etc., with the one-dimensional particle-in-the-box model. What length polyene (i.e., number of C atoms) is required to absorb light in the red region of the spectrum? How does tha..
3.2 grams of a compound with a molar mass of 96.0 g/mol dissolved in 50.0 grams of water gave a solution which freezes at -1.50 °C. Kf for water is 1.86 °C/m. The van't Hoff factor for this solution is
Describe the difference between the following and list any particular advantage possessed by one over the other a)hydrogen and deuterium discharge lamps as sources for ultraviolet radiation
SO3 can be produced in the following two-step process: FeS2 + O2 ---> Fe2O3 + SO2 , SO2 + O2 ----> SO3 Assuming that all the FeS2 reacts, how many grams of SO3 are produced when 20.0 g of the FeS2 reacts with 16.0 g of O2?
Tetraphosphorus decaoxide reacts with water to form phosphoric acid, a major industrial acid. In the laboratory, the oxide is used as a drying agent.
What is the density of gold if a ring with a volume of 2.656 cubic centimeters has a mass of 51.26 grams?
determine the percent yield for the reaction between 3.74g of na and excess o2 if 5.35g of na2o2 is
one of the standard solutions had an abnormally low absorbace reading, causing a less positive slop for the data plot. a. Will the equilibrium concrentration of feNCS2+ in the test tube be too high or too low?
Calculate in kilojoules per mole the energy necessary to completely remove an electron from the first shell of a hydrogen atom R infty = 1.097 times10^-2 nm^-1
A chemist titrates 100 ml. of .020 M aqueous ammonia solution with .10 M HCl at 25 degrees C. What is the pH of the solution after 20 ml of HCl have been added to the solution?
The freezing temperature of ethanol is -114.0 oC, the density is 0.789 g/cm3, and Kf is 1.99oC/m. Calculate the new freezing point when 0.100 L of methanol
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