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An ecobotanist separates the components of a tropical bark extract by chromatography. She discovers a large proportion of quinidine, a dextrorotatory isomer of quinine used for control of arrhythmic heartbeat. Quinidine has two basic nitrogens (Kb1 = 4.0 multiplied by 10-6 and Kb2 = 1.0 multiplied by 10-10). To measure the concentration, she carries out a titration. Because of the low solubility of quinidine, she first protonates both nitrogens with excess HCl and titrates the acidified solution with standardized base. A 32.35 mg sample of quinidine (M = 324.41 g/mol) is acidified with 6.15 mL of 0.150 M HCl.
(a) How many mL of 0.0150 M NaOH are needed to titrate the excess HCl?
(b) How many additional milliliters of titrant are needed to reach the first equivalence point of quinidine dihydrochloride?
(c) What is the pH at the first equivalence point?
Heart pacemakers are often powered by lithium-silver chromate "button" batteries. The overall cell reaction is: 2 Li(s) + Ag2CrO4(s) ? Li2CrO4(s) + 2 Ag(s) The overall cell potential is 3.5V. What is the half-cell potential for the follow half rea..
A Researcher reads directions that call for addition of 25.0 mL of anhydrous ethanol (ethyl alcohol). From among the bottles in the lab, which one should she select
understanding of chemistry basics.1. boltzmanns critics claimed his work was unscientific because he.a. presented his
While carrying out Part A, some of the solid calcium hydroxide is inadvertently transferred to the beaker and titrated. a. Will more, less, or the same amount of HCl be used for the titration? Explain.
Suppose that a gas obeys the modified van der Waals equation P(Vm-b)=RT, and that b has a value of 0.0200 dm^3 mol^-1. If 0.500 mol of the gas is reversibly compressed from an initial volume of 2.00 dm^3 to a final volume of 0.500 dm^3 how much wo..
The standard electrode potential for the reduction of Eu3+(aq) to Eu2+(aq) is ?0.43 V. Use the data in Appendix D to determine which of the following is capable of reducing Eu3+(aq) to Eu2+(aq) under standard-state conditions
Present-day carbon (in living matter) gives 15.3 disintegrations per minutes per gram of total carbon. Determine the date of the volcanic eruption. Recall that the half-life of carbon-14 is 5730 y.
The volume of the bulb was 1.524 liters. The temperature was 28.40 C, and the manifold pressure was 637.6 torr. What volume, in liters, would this gas sample occupy at STP?
2C8H18(l) + 25O2(g) => 16CO2(g) + 18H2O(l) ?H = -11,200. kJ Standard enthalpies of formation, ?Hf: CO2(g), -393.5 kJ/mol; H2O(l), -285.8 kJ/mol Use the above data to calculate the standard enthalpy of formation of octane, C8H18(l).
Which of the following are ways that catalysts can speed up reactions rates? You must check all answers that apply.
a graduated cylinder reads 4 ml of water.then a shell is dropped into it and the water level rises to 12 ml.what is the volume of the shell?
A human body contains 6 liters of blood. The hemoglobin content of blood is about 15.5g/100 mL of blood. The approximate hemoglobin molecular weight is 64,500g/mol. How many moles of hemoglobin are present in a typical adult
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