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

Jul 31, 2016

${\text{NH"_ (3(aq)) + "HCl"_ ((aq)) -> "NH"_ 4"Cl}}_{\left(a q\right)}$

#### Explanation:

Hydrochloric acid, $\text{HCl}$, a strong acid, will react with ammonia, ${\text{NH}}_{3}$, a weak base, to form aqueous ammonium chloride, $\text{NH"_4"Cl}$, according to the following chemical equation

${\text{NH"_ (3(aq)) + "HCl"_ ((aq)) -> "NH"_ 4"Cl}}_{\left(a q\right)}$

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

${\text{NH"_ (3(aq)) + "H"_ ((aq))^(+) -> "NH}}_{4 \left(a q\right)}^{+}$

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, ${\text{NH}}_{4}^{+}$, 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