# A student combines solutions of silver nitrate, AgNO_3, and sodium chromate, Na_2CrO_4, and observes that a reddish-brown solid forms. Based on this observation, what type of a reaction can the student infer has occurred?

$2 A g N {O}_{3} \left(a q\right) + N {a}_{2} C r {O}_{4} \left(a q\right) \rightarrow 2 A g N {O}_{3} \left(a q\right) + A {g}_{2} C r {O}_{4} \left(s\right)$
The reaction could also be called a $\text{precipitation reaction}$. This particular reaction is the basis of the $\text{Mohr titration}$, for quantitative analysis of silver ion.