What is the {anion} for {conjugate acid} of {sulfate ion}
What are the properties of sulfate ion?
 select distinct ?obj where { wd:Q172290 wdt:P4147 ?obj . ?obj wdt:P31 wd:Q107968 } 
select distinct ?obj 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> ?obj . ?obj <http://www.wikidata.org/entity/P31> <http://wikidata.dbpedia.org/resource/Q107968> } 
What are the sulfate ion properties?