Ask Question
29 November, 19:52

Glycine has two ionizable groups, a carboxyl group and an amino group. Calculate the fraction of glycine that has its amino group protonated at pH 8.6. The pKa values for glycine are pK1 = 2.34 (carboxyl group) and pK2 (amino group) = 9.60.

+1
Answers (1)
  1. 29 November, 20:55
    0
    0.9

    Explanation:

    Considering the Henderson - Hasselbalch equation for the calculation of the pH of the buffer solution as:

    pH=pKa+log[base]/[acid]

    Given that:

    pH = 8.6

    pK2 will be used for the amino group which is = 9.60

    So,

    8.60=9.60+log[base]/[acid]

    log[base]/[acid]=1.0

    [base]/[acid] = 10

    So,

    [base] = 10 [acid]

    Fraction is:

    [base] / ([base] + [acid]) = 10 [acid] / 10 ([acid] + [acid]) = 10 / 11 = 0.9
Know the Answer?
Not Sure About the Answer?
Get an answer to your question ✅ “Glycine has two ionizable groups, a carboxyl group and an amino group. Calculate the fraction of glycine that has its amino group ...” in 📙 Chemistry if there is no answer or all answers are wrong, use a search bar and try to find the answer among similar questions.
Search for Other Answers