Answer the following question given this paragraph: 

Selective precipitation can also be used in qualitative analysis. In this method, reagents are added to an unknown chemical mixture in order to induce precipitation. Certain reagents cause specific ions to precipitate out; therefore, the addition of the reagent can be used to determine whether the ion is present in the solution.


Q: In qualitative analysis, reagents are added to an unknown chemical mixture in order to induce what?


A:
precipitation