Which of the compounds above are strong enough acids to react almost completely with a hydroxide ion (pka of h2o = 15.74) or with a bicarbonate ion (pka of h2co3 = 6.37) ?

I believe we are given the following compounds and their corresponding pKa’s:

pyridinium pKa = 5.25

acetone pKa = 19.3

butan-2-one pKa = 19

Based on this, we can say that:

Pyridinium is going to react with both OH - and HCO3-, whereas the other 2 will only react with concentrated OH-