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A 100.0, mL of 10.0 mM phosphate buffer, pH 7.5 (pKa2 = 7.2). You are provided with 0.200 M KOH and 0.100 M KH2PO4 solutions. Calculate volume of KOH and KH2PO4 solutions. (HINT: determine the mole ratio of the salt (K2HPO4) and acid ( KH2PO4) using buffer equation, then calculate the volume of KOH and KH2PO4 required) Please also note that the K2HPO4 is formed by mixing KOH and KH2PO4 together.
KOH + KH2PO4 --> K2HPO4
A 1.5991 g sample of a hydrocarbon is combusted to give 1.6918 g of H2O and 5.1661 g of CO2. What is the empirical formula of the compound
A cylinder contains 250 g of Helium at 200 K. The external pressure is constant at 1 atm. There is an increase in temperature of 56 K. Calculate the heat lost or gained by the system in response to this change in the external temperature.
What is the change in the internal energy of the system as the system travels down the isotherm from state A to state C? Change in internal energy down the isotherm
Calcium fluoride Ca F 2 is an insoluble salt. The Ksp is 3.4 x 10 -11. Calculate the molar solubility of calcium fluoride. If the concentration of fluoride in fluoridated drinking water is 1 x 10 -5 M and the calcium ion concentration in blood is 2..
An 8mL sample of an unknown concentration of NH3 is titrated with HCl. It is found that 12mL of 0.10M HCl is required to reach the equivalence point. What was the concentration of the NH3 in the initial 8mL sample?
100.0g of Cl2O7 are mixed with excess of water obtaining 136.0g of periodic acid according to the following reaction. Determine the percent yield of HClO4.
Suppose an integral membrane protein diffuses in a cell membrane at a rate of 1.04 square centimeters per 0.09 seconds. Express this rate as an integer with the correct number of significant figures.
Why do you suppose that the dehydration of cyclohexanol to cyclohexene has been the tradiotional experiment to illustrate the acid-catalyzed dehydration of an alcohol to an alkene?
Using K=3.9 as the equilibrium constant, Keq, Compute the amount of Isoamyl acetate, also known as isopentyl acetate (C7H14O2 )that must be present at equilibrium.
How can their efficiency be less than 100% and the Law of Conservation of Energy still be valid? An incandescent light bulb functions because of the flow of electric current. Does the incandescent light bulb convert all of the electrical energy to..
Calculate the vapor pressure of the solution at 25oC when 12.43 grams of testosterone, C19H28O2 (288.4 g/mol), are dissolved in 246.7 grams of diethyl ether.
A compound is 40.0%C, 6.70%H, and 53.3%O by mass. Assume that we have a 100.g sample of this compound. What are the subscripts in the empirical formula of this compound?
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