Analytical Chemistry question: Find the pH and the concentration of each species of lysine in a solution of 0.0010 M lysine*HCL.

I know that the pKAs of lysine are
9.07 (�-NH3)
10.82 (�-NH3)
but I am not sure where to go from there.

  1. 👍 0
  2. 👎 0
  3. 👁 242
  1. Note: I am unfamiliar with how the alha amino acids dissociate so look at what follows with a skeptical eye. Here is what I think.
    With a concn of 0.001 the hydrochloride will consist of the fully protonated amino acid plus the chloride ion. You can assign 0.001 to (Cl^-) right off the bat.
    Then you note that the pKa2 and pKa3 is so much higher than pKa1 so the ionization of the first group (the COOH) can be calculated and ignore that from pKa2 and pKa3. Thus, treat the first ionization just like you would a simple monoprotic acid, HA
    ........HA ==> H^+ + A^-

    Solve for x and convert to pH. Undoubtedly you will need to use the quadratic equation. Here is a web site that may prove useful to you. The information on this site does not ignore the other species as I have done.

    1. 👍 0
    2. 👎 0
    posted by DrBob222

Respond to this Question

First Name

Your Response

Similar Questions

  1. science(chem)

    For Mass-Balance eqzns, in my text it is described as "relating the equillibrium concentrations of various species in a solution to one another and to the analytical concentrations of the various solutes. Is the analytical

    asked by christina on July 15, 2007
  2. chemistry

    How do you make a venn diagram of the 6 branches of chemistry? (Inorganic chemistry, organic chemistry, biochemistry, nuclear chemistry, physical chemistry, and analytical chemistry) like where would they go in the 3 circles

    asked by jake on August 26, 2012
  3. chemistry

    Lysine, an essential amino acid in the human body, contains C,H,O and N only. In an experiment, the complete combustion of 2.175 g lysine gave 3.94 g of CO2 and 1.89 g of H2O. In another reaction, the nitrogen content of 1.873 g

    asked by helly on December 2, 2013

    how can different steps in the analytical process help in solving probs in Analytical Chemistry

    asked by Patrick on November 26, 2014
  5. chemistry

    glycine and lysine, have the following values of the relevant acid dissociation constants (pKa) glycine, pKa=2.35 lysine,pKa=10.79 For an aqueous solution of glycine alone, calculate the value of pH at which the ratio of the

    asked by Will on August 26, 2014
  6. Chemistry

    Lysine, an essential amino acid in the human body, contains C,H,O, and N. In one experiment, the complete combustion of 2.175g of lysine gave 3.94g CO2 and 1.89g H2O. In a separate experiment, 1.873 g of lysine gave 0.436 g NH3.

    asked by Amy~ on August 27, 2010
  7. chemistry

    Where can I find the answers to these questions in my text, "fundamentals of analytical chemistry" by skoog, west, holler and crouch. 1. Why is acetylsalicylic acid analyzed using back titration? 2. Discuss the importance of

    asked by smiley on July 14, 2007
  8. Chemistry

    Dear sir, madam, I am having a little problem with the solution my chemistry book gives on the following problem: We have a person whose body vitamine C concentration decays according to the following formula: 1500*0,974^t.

    asked by Tom on October 17, 2012
  9. Biochemistry

    Can anyone help?? What are the Concentrations of the various ionic species of a 0.1 M solution of lysine at pH4?

    asked by Emily on September 7, 2007
  10. Science

    A biologist made population counts of four different species of animals in an ecosystem. What can you infer from these numbers about possible predator-prey relationships between the species? Species A 155 Species B 17 Species C

    asked by Steve on December 27, 2013

More Similar Questions