Question

question:
Given the pKa data, which of the following bases is(are) strong enough to deprotonate C6H5OH (pKa = 10) so that the equilibrium lies to the right?
Compound pKa
H3O+ –1.7
NH4+ 9.4
H2O 15.7
NH3 38
Answer Choices
[1] NaOH
[2] NaNH2
[3] NH3
[4] Compounds 1 and 2 are strong enough to deprotonate C6H5OH.
[5] Compounds 1, 2, and 3 are all strong enough to deprotonate C6H5OH.

It's been a while since I did acid bases. All I seem to remember is that ph=-log[Ka] or something.

Answer 1

pH= - log [H+]

Answer 2

Pka= - log ka

Answer 3

i guess, [5]