Question

The ethylammonium ion, CH3CH2NH3+, has a pKa of 10.81. It reacts with water to form ethylamine, CH3CH2NH2 and H3O+.

Which of the following statements is true at pH 7?

A.) ethylamine predominates

B.) ethylammonium ion predominates

C.) the pH is higher than pKa of the ethylammonium ion

D.) the concentration of ethylamine equals that of ethylammonium ion

Can't you answer this with the Henderson-Hasselbalch equation? Plug in pH and pKa and solve for (base)/(acid). That should answer if A is right, if B is right, or D is right. C can be answered from the problem.

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