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    aminadisco's Avatar
    aminadisco Posts: 1, Reputation: 1
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    #1

    Sep 3, 2003, 08:30 PM
    isoelectric points and pH problems
    Hello there,
    I am lost when it comes to pH. Please help me with the following problems asap. I don't know how to do them

    1) What is the isoelectric point of the tripeptide Ala-Glu-Asn?

    2) If you add 1ml of .2 N NaOH to 100ml of .02 M phosphate buffer, pH 7.0, what would be the resulting pH when pKa(2) = 6.7

    3) Calculate the pH of 100ml .08% (w/v) NaOH. If you now add 100ml of .02N HCl to the above solution, what would be the pH?
    baoloa's Avatar
    baoloa Posts: 8, Reputation: 1
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    #2

    May 31, 2004, 12:04 AM
    isoelectric points and pH problems
    Go here:
    http://us.expasy.org/tools/pi_tool.html

    Ala-Glu-Asn in the single letter code is AEN

    Paul
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