Organic Chemistry

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Rank the following compounds in order of increasing acidity.
a. H2O, H3O-, Ho- == HO-, H2O, H3O-
b. NH3

  • Organic Chemistry -

    Is this to show your answer? I would agree with OH^- to H2O to H3O^+ but I don't know what H3O- is.
    And I don't understand part b.

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