What is <conjugate base> of <sulfate ion> ?
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Conjugate base of sulfate ion?
SELECT DISTINCT ?z WHERE { ?z property:conjugate_base resource:sulfate_ion }
select distinct ?answer where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject>  ?answer. ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P4149> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q172290>. }
select distinct ?answer where { ?answer wdt:P4149 wd:Q172290}
hydrogen sulfate ion