Question

25. What species is/are present in a 1.0 M solution of HNO,?! a) Only HNO2 molecules b) Only HNO, molecules and H2O molecules c) Only H3O, NOions, and H2O molecules d) HNO2 molecules, H3O+ ions, NO, ions, and H2O

Answer 1

Solution of HNO₂ in water dissociate into H₃O⁺ + NO₂^- ions. HNO₂ is weak acid. Thus unreacted or undissociated HNO₂ is also present. Thus 1.0 M solution of HNO₂ contain HNO₂, H₃O^+, NO₂^- ions and H₂O. Thus answer is d option.