Chemistry 30

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Solutions Lab

Precipitation Reactions

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Overview:

When two aqueous solutions of ionic compounds are combined in a double displacement reaction, a precipitate may form.

A precipitate is a solid that forms when a cation from one aqueous solution and an anion from another solution form an insoluble compound. This will occur when the attraction between the oppositely charged ions is stronger than the attraction of the individual ions to polar water molecules. Any precipitate that forms will rapidly come out of solution.

If, on the other hand, no insoluble combination between anions and cations exist, no precipitate will form. Instead, all ions remain in solution and no reaction will occur.

In this lab you will use your knowledge of precipitation tables to predict precipitation reactions. You will then test your predictions by combining pairs of solutions to see if a precipitate forms.

Purpose

  • To predict precipitation reactions.
  • To observe a variety of precipitation reactions
  • To write net ionic equations for precipitation reactions

Methods & Equipment & Procedure

  • See the print versions of this lab for full details
Credits | Central iSchool | Sask Learning | Saskatchewan Evergreen Curriculum | Updated: 31-May-2006