What is the {polyatomic anion} for {conjugate base} of {water}
Which polyatomic anion is required for the conjugate base of water?
The conjugate base of water requires which polyatomic anion?
SELECT DISTINCT ?r WHERE { resource:water property:conjugate_base ?r . ?r rdf:type ontology:polyatomic_anion }
select distinct ?obj where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q283> . ?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> ?obj . ?obj <http://www.wikidata.org/entity/P31> <http://wikidata.dbpedia.org/resource/Q55511438> } 
 select distinct ?obj where { wd:Q283 wdt:P4149 ?obj . ?obj wdt:P31 wd:Q55511438 } 
hydroxide ion