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100 ml of 0.1M His solution at pH = 0.5 is titrated with 0.1M NaOH until the pH reaches 13. The pKa values for His are 1.8, 6.0 and 9.2. Using this information:
(a) Sketch the titration curve, being sure to label the pH and volume axes. Indicate clearly the volume of 0.1M NaOH required to raise the pH to the pI of His, the volume of 0.1M NaOH required to raise the pH to values equal to each pKa, and the volume required to convert all of the ionizable group to the conjugate base form.
(b) Calculate the pH of the solution after the addition of 30ml of 0.1M NaOH.
(c) Draw the structure of the form is His predominating in solution at neutral pH.
For caffeine, the partition coefficient between methylene chloride and water is approximately 8. If you add the following to a separatory funnel - 10 g caffeine,
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A 128.2-mL sample of a 0.15 M solution of H3PO4 is titrated with 0.18 M NaOH. What volume of base must be added to reach the third equivalence point
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The theoretical value can be computed from the atomic weights of the atoms involved. How
Determine the molecular mass and its uncertainty for CH3CH2COOH. Note: Pay attention to significant figures and use the atomic masses given in the table.
A gas expands and does P-V work on the surroundings equal to 343 J. At the same time, it absorbs 159 J of heat from the surroundings. Calculate the change in energy of the gas.
The volume of a gas sample is 650. mL at STP. What volume will the sample occupy at 25.0°C and 950. torr pressure.
Explore the effects of acid rain pre and post the 1990 Clean Air Act. Pair up and choose one of the topics listed below. One person should research and report on the damage that was being observed due to acid rain prior to 1990.
These 3 solutions including 2.362 g of Rb2S, 1.635 g of NaClO 4 , and 0.796 g of CuCl 2 , respectively are combined together? now calculate what would be the mass of this precipitae?
After allowing the solution to sit for 30 minutes the student determines that the bromide concentration was [Br-]= 0.0012 M. What is the Pb2+ concentration?
Which of the following statements is true? a. The critical temperature must be reached to change liquid to gas. b. To melt a solid at constant pressure, the temperature must be above the triple point.
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