What is <conjugate base> of <ammonium cation> ?
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Wich means{conjugate base} in {ammonium cation} ?
SELECT DISTINCT ?z WHERE { resource:ammonium_cation property:conjugate_base ?z }
select distinct ?answer where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q190901> . ?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> ?answer. }
select distinct ?answer where { wd:Q190901 wdt:P4149 ?answer}
Ammonia