Konjugovaný pár spolu s HCOO− ve vodném roztoku kyseliny mravenčí je podle Brønstedovy teorie:
Správná odpověď je: B
HCOO– představuje anion kyseliny mravenčí (methanové). Konjugovaný pár je dle Brønstedovy teorie kyselin a zásad tvořen dvěma molekulami, které se vzájemně strukturně odlišují právě o jeden proton (H+). Brønstedova teorie také definuje kyselinu jako molekulu, která je schopna odštěpit proton H+, zatímco pojem zásada/báze označuje molekulu, která je schopna proton H+ přijmout. Anion HCOO– se tedy v roztoku bude chovat jako báze, protože je schopen přijmout proton; pokud k tomu dojde, vznikne k této bázi konjugovaná kyselina, a sice kyselina mravenčí HCOOH. Zbylé nesprávné možnosti nabízejí pouze vodu H2O a produkty její autoprotolýzy, tedy hydroxidový anion OH– a oxoniový kation H3O+.
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