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How many grams of monosodium phosphate and disodium phosphate are needed to make 1L of 0.1M phosphate buffer at pH 7.4? The exact pKa for inorganic phosphate are 2.15, 6.82, and 12.38.
Calculate the number of moles of oxygen gas produced from the completely catalyzed decomposition of 6.20ml sample of a 3.5% solution of H2O2. The density of the 3.5% solution of H2O2 is 1.01 g/ml.
replacement compounds for the Freons have gone into production: HFC-134a (chemical formula: CH 2 FCF 3 ) and HCFC-124 (formula:CHClFCF 3 ) In 1991. Determine the molar masses of these two compounds
What is the fundamental difference between a voltaic cell and an electrolytic cell. Can a voltaic cell in which both half-reactions are the same generate a current.
What is the pH of a solution in which 258 mL of HCl(g), measured at 27.5^circ C and 1.02 atm, is dissolved in 1.5 L of aqueous solution?
What is the thickness of the foil. the question asks for the thickness of foil in millimeters and also tells that the density is 2.699 g/cm^3.
Consider the reaction: CaCO3(s)===CaO(s)+CO2(g) An equilibrium mixture of this reaction at a certain temperature was found to have [CO2] = 0.478M. What is the value of the equilibrium constant at this temperature
Consider the molecules ClF3O and BrF3O. (a) Would expect the lone pair on the central halogen to be axial or equatorial in these molecules? Explain
calculate the volume of 1.420 M NaOH required to titrate 38.70 ml of a 1.50 M H3PO4 solution
An "empty" container is not really empty if it contains air. How many moles of nitrogen are in an "empty" two-liter cola bottle at atmospheric pressure and room temperature
What is ?, the electromotive efficiency to three significant figures?? Open the hint panel below for the definition of electromotive efficiency. (d) What is the pH of an unknown that gives a reading of 19.6 mV with this electrode at 30°C?
A zero-order reaction has a constant rate of 1.60×10-4 . If after 35.0 seconds the concentration has dropped to 2.50×10-2 , what was the initial concentration?
Ammonia reacts with oxygen gas to priduce water and nitrogen gas. What mass of oxygen gas must be used to react
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