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For the H2PO4- -HPO4-2 bufer system, pka=7.21. If the pH of a urine sample is 5.6 and its total phosphate concentration is 46.6mmol/L, calculate the concentration of each phosphate species in the sample.
the background section describes why you want the bleach to be far in excess of the dye. state how much greater the
the balanced chemeical equation for the reaction of magnesium metal in oxygen gas and for the rection of magnesium metal in nitrogen gas
Why was anhydrous not wet diehtyl ether used in the preparation and reaction of the grignard reagent
Why is this a reasonable assumption for those products, but not for cyclohexane and toluene?
the usefulness of the addition of an internal retention time standard that elutes near the end of the chromatogram
A balloon has a volume of 10,500 liters, and the temperature is 15°C. If the temperature were -25°C, what would the volume of the balloon be?
Calculate the molarity of 52.56 grams of Al2(SO4)3 in 1.80 L of solution.
List a balanced chemical equation for each of these chemical reaction types and explain how it is used
When 35.0 g of an unknown nonelectrolyte is dissolved in 220.0 g of benzene, the solution boils at 83.2°C. Calculate the molecular weight of the unknown nonelectrolyte. The Kb for benzene = 2.53°C/m. The boiling point of pure benzene is 80.1°C.
Calculate the wavelength in nanometers of the spectral line in the visible spectrum of hydrogen for which n1 = 2 and n2 = 3. What color is this line?
An electron in the n = 7 level of the hydrogen atom relaxes to a lower energy level, emitting light of 93.1 nm. What is the value of n for the level to which the electron relaxed
In the oxidation of glucose (C6H12O6), water and carbon dioxide are formed when the sugar is reacted with oxygen gas. If 4.39 grams of glucose are reacted, assuming 100% yield, how many moles of carbon dioxide would evolve?
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