Which equilibrium system has hco3- acting as a brønsted-lowry base?
hco3- h+ + co32-
hco3- + hs- h2s + co32-
hco3- + h2s h2co3 + hs-
hco3- + h2o h3o+ + co32-
hco3- + o2- co32- + oh-

C) HCO3- + H2S H2CO3 + HS-

Explanation:

Edmentum

the number of valence electrons for each molecule or ion is shown beneath the structure. remember hydrogen will not have more than two electrons. this hydrogen is part of a covalent bond (sharing two electrons). a double bond here would cause hydrogen to share four electrons with phosphorus.

i just learnt this recently but i need to look through my notes again