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Analytical Chemistry

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You prepare a solution from 10.0 mL of 0.100 M MOPS buffer (3-morpholinopropane-1-sulfonic acid) and 10.0 mL of 0.086 M NaOH. Next, you add 1.00 mL of 8.87 × 10-4 M lidocaine to this mixture Denoting lidocaine as L, calculate the fraction of lidocaine present in the form LH .
ka= 6.3x10^-8
kb=8.7x10^-7

  • Analytical Chemistry -

    This is what I think, but I can not be sure.

    0.001 moles of MOPS buffer
    0.00086 moles of NaOH
    1.4 x 10^-4 moles of MOPS left to react with L

    1.4 x10^-4/total volume =6.67 x 10^-3 M of MOPS
    8.87 x 10^-7 moles of L/total volume=4.2 x 10^-5 M for L

    HA + L--> A + LH

    8.7 x 10^-7=x^2/(6.67 x 10^-3 M)(4.22 x 10^-5 M)

    x=4.95 x 10^-7

    4.95 x 10^-7/4.2 x 10^-5 M =1.17x 10-2


    Once again I am not sure!!!!!!

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