What is the chemical equation for titration of HCl + NH_3?

1 Answer
Stefan V.
Jul 31, 2016

"NH"_ (3(aq)) + "HCl"_ ((aq)) -> "NH"_ 4"Cl"_ ((aq))

Explanation:

Hydrochloric acid, "HCl", a strong acid, will react with ammonia, "NH"_3, a weak base, to form aqueous ammonium chloride, "NH"_4"Cl", according to the following chemical equation

"NH"_ (3(aq)) + "HCl"_ ((aq)) -> "NH"_ 4"Cl"_ ((aq))

In this particular reaction, the chloride anions, "Cl"^(-), act as spectator ions, which means that you can eliminate them from the balanced chemical equation to get the 8net ionic equation*

"NH"_ (3(aq)) + "H"_ ((aq))^(+) -> "NH"_ (4(aq))^(+)

It's worth mentioning that because you're titrating a strong acid with a weak base, the pH of the resulting solution will be lower than 7 at equivalence point.

That is the case because this neutralization reaction produces the ammonium cation, "NH"_4^(+), which acts as a weak acid in aqueous solution.

Assuming that you're running ammonia into hydrochloric acid, the titration curve will look like this

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