What is <conjugate acid> of <sulfate ion> ?
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Sulfate ion has what conjugate acid?
SELECT DISTINCT ?g WHERE { resource:sulfate_ion property:conjugate_acid ?g }
select distinct ?answer where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q172290> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P4147> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?answer. }
select distinct ?answer where { wd:Q172290 wdt:P4147 ?answer}
hydrogen sulfate ion