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Methylamine (CH3NH2) forms hydroxide ions in aqueous solution. Why is methylamine a Brønsted-Lowry base but not an Arrhenius base?
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    The old definition of an Arrhenius base was that the substance contained hydroxide ion.Under that definition CH3NH2 is not a base because it doesn't contain OH ions. However, the definition has been modified to make it fit more modern times. Frankly, I consider CH3NH2 an Arrhenius base, too, because the modified definition of an Arrhenius base is one that produces OH^- in solution and CH3NH2 does just that.

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