Question

For NH4+, write an equation that shows how the cation acts as an acid.

For NH4+, write an equation that shows how the cation acts as an acid.

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Answer #1

According to Arrhenius theory an acid is the one which gives a proton or hydronium ion in aqueous solution.

For example HCl is an Arrhenius acid

HCl (aq) --------> H+ + Cl-

Similarly we can show NH4+ an Arrhenius acid as

NH4+(aq)-------> NH3 + H+

According to Bronsted -Lowry an acid is the one that can donate a proton.

Thus HCl is an acid as per equation

HCl + H2O <------> H3O+  + Cl-

Similarly NH4+ is an acid as

NH4+  + H2O <--------> H3O+ + NH3

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