Which reaction may be described as an acid base neutralization reaction?

Question

A. HNO2 +H20 --> H3O + NO2

B. NaOH + H20 --> H3O + NaO-

C. Ba (OH) + LiCl --> BaCL2 + 2 LiOH

D. Be (OH) + H2SO4 -->BeSO4 + 2 H2O

Answer 1

D

Answer 2

The obvious answer is (D).  Be(OH)2 is a base because it provides hydroxide ion, and of course H2SO4 is sulfuric acid.

Interestingly enough, reaction (A) is an acid base reaction, of sorts.  Water is amphoteric, meaning that water can behave as either an acid or a base.  In this case it acts as a base and accepts a "proton" (H+ ion) from the weak acid HNO2.  Hydronium ion (H3O+) and nitrite ion (NO2-) are produced.

HNO2 + HOH <==> H3O+ + NO2-