Consider the two equations below.
H2SO4(aq) + H2O(l) → H3O+(aq) + HSO−4 (aq)
NH3(g) + H2O(l) ⇄ NH+4 (aq) + OH-(aq)
They illustrate that water is

A- an acid in both reactions.

B- a base in both reactions.

C- amphoteric.

D- a weak electrolyte.

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answer is correct A- an acid in both reactions.

with solution

H2SO4/HSO4- is an acid/conjugate base pair. H20 is the base in the forward rxn, because it accepts a proton, and becomes H3O+. H20/H3O+ is a base/conjugate acid pair.

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