Precipitation Lab

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Double Replacement reaction where solids are formed are called Precipitation Reactions. These reactions are often used to determine if a specific ion (either cation or anion) are present in a solution of an unknown substance.

The objective of this lab is to produce precipitate from two known solutions. From these reactions, you can determine which cations combining with anions to form a solid product (precipitate).

Procedures
1. You will be given 2 sets of 3 solutions.
2. Using a well plate (see below), one set with be the rows and the other set will be the columns. (3X3 grid)
3. Add about 1/4 of the well with one solution (from row) and then add 1/4 of the well with the solution (from the column).
4. Make observation of both solution before reaction and if a precipitate formed and what it looked like.
5. Go to the next reaction.

Calculation
1. Give the balanced chemical reactions (including phases) and then a net ionic reaction.
2. If the reaction does not occur, give the potential product including phase and complete a net ionic reaction (to prove no reaction).

Questions for Precipitate Reaction Lab

Precipitation Lab Matrix

Solution 1 2 3

A ____ ____ ____

B ____ ____ ____

C ____ ____ ____

Notes:
Solution A : Silver nitrate
Solution B : Potassium sulfate
Solution C : Potassium carbonate
Solution 1 : Lead (II) nitrate
Solution 2 : Calcium chloride
Solution 3 : Barium acetate