Konjugovaný pár podle Brønstedovy teorie tvoří:
Správná odpověď je: A
Brønsted‑Lowryho teorie kyselin a zásad zavádí pojem konjugovaný pár, což je pár tvořený dvěma molekulami, vzájemně se lišícími právě o jeden proton H+. Dále tato teorie říká, že kyselina je molekula schopná odštěpit proton H+, zatímco zásada/báze je molekula schopná proton do své struktury přijmout. V rámci konjugovaného páru tedy hovoříme o konjugované kyselině a konjugované bázi. Molekula vody se může chovat jako kyselina i báze, pár H2O + OH– tedy představuje konjugovaný pár, v němž je H2O konjugovanou kyselinou a OH– konjugovanou bází. Kyselina octová CH3COOH a anion kyseliny mravenčí se strukturně liší o více než 1 proton H+, nejedná se tedy o konjugovaný pár; stejně tak konjugované páry netvoří ani draselný kation K+ a hydroxidový anion OH– nebo amoniak NH3 a voda H2O.
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