The structure of threonine is shown at the right along with the pK values of the

Question

The structure of threonine is shown at the right along with the pK values of the ?-carboxyl and ?-amino groups. Calculate the partial charge on threonine at pH 2.90. (Ignore activity coefficients.)

12/9/2014 11:00 AM A91/100 12/6/2014 05:42 PM Print Calculator-Periodic Table 91/100 1 Gradebook Question 29 of 43 sapling leaming The structure of threonine is shown at the right along with the pK values of the - carboxyl and -amino groups. pK, = 9.62 H3N-CH-C-OH pK,-2.11 Calculate the partial charge on threonine at pH 2.90. (Ignore activity coefficients.) CH -OH Number CH3 O Previous 8 Give Up & View Solution O Check Answer Next Exit Hint

Explanation / Answer

the partial charge on threonine at pH 2.90 = zero

given pK2>pH>pK1 . so at pH = 2.90 it exists as zwitter ion (carboxyl group releases its H+ ion) . so total charge = (+1) (on NH3+) + (-1) (on carboxyl group) = 0

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