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Quinine (C20H24N2O2) is the most important alkaloid derived from cinchona bark. It is used as an antimalarial drug. For quinine pKb1 = 5.1 and pKb2 = 9.7 (pKb=-log Kb). Only one gram of quinine will dissolve in 1900.0 mL of solution. Calculate the pH of a saturated aqueous solution of quinine. Consider only the reaction Q H2O 34 QH^+ + OH- described by pKb1, where Q= quinine
A solution is made by dissolving 5.00 g of iodine in 100 mL of methanol (density = 0.791 g/mL) to form a solution. What is the mass percent solute in the solution.
What types of bonds are responsible for the secondary structure of a protein? How would the addition of a heavy metal affect the secondary structure of a protein?
If 0.0050 mol of methyl acetate is dissolved in 10.0 grams of tert-butanol, what is the expected freezing point depression in celcius degrees?
suppose 2.3754g of copper(II) sulfate pentahydrate is heated to drive off the water of crystallization. Calculate what weight of anhydrous salt will remain?
Hydrogen is produced when methane(CH4) reacts with water. The other product is CO2. Using 80.0g of methane and 16.3g of water, how many liters of H2 can be produced at STP? what is the limiting reactant?
Rubidium has two naturally occuring isotopes. The relative abundance of rubidium-85 is 72.17%; its atomic mass is 86.91 amu. Determine the average atomic mass of rubidium.
If 158 of wet hydrogen is collected over water at 24 and a barometric pressure of 736 , how many grams of hydrogen have been consumed.
What is the percent yield if 6.25 g S2Cl2 is isolated from the reaction of 10.0 g S8 and 7.50 g Cl2?
Solutions of sodium thiosulfate are used to dissolve unexposed AgBr ( Ksp= 5.0E-13) in the developing process for black-and-white film. What mass of AgBr can dissolve in 1.00L of 0.500M Na2S2O3?
A 2.42-L flask is filled with propane gas (C3H8), at 1.00 atm and -13.0°C. What is the mass of the propane in the flask.
What volume of .250 M calcium chloride would be required to precipitate silver chloride if it is mixed with 600.0 ml of 0.650 M Silver nitrate.
Calcultate what is the value of enthalpy H reaction If the temperature increased from 35.0 degree celsius to 76 degree celsius and the heat capacity of the calorimeter = 23.3kj/c ? (the molar mass of C2H5OH = 46.07g/mol. )
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