How do you differentiate between bases and alkali?

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    Alkali as well as base neutralize acid but we have observed that alkali produce ##OH^-## ions in the water whereas bases such as copper oxide and ferrous do not produce ##OH^-## ions.
    All alkali are base but all bases are not alkali.
    Hi Friend !
    This is really a interesting question but we make it very easy:
    First we understand alkali any substance that produces OH- (hydroxide ions) in aqueous solution is called alkali.
    Here are some examples:
    1) Sodium hydroxide solution – ##NaOH_((aq))##.
    2) Calcium hydroxide solution – ##Ca(OH)_2####(aq)##
    3) Ammonia solution – ##NH_3####(aq)##.
    Now we will discuss on the Base:
    Any substance that will neutralize an acid
    but does not dissolve in water is called a base.
    Here are some examples:
    Copper oxide ferrous oxide and zinc carbonate are the good examples of base.
    No doubt alkali as well as base neutralize acid but we have observed that alkali produce ##OH^-## ions in the water whereas bases such as copper oxide and ferrous do not produce OH- ions.
    bases are metallic oxides

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