Adv. Chem - 9/2 - Precipitation Video Lab Report

I. Reaction and stoichiometry review: Solutions containing 25.0g of lead (II) chloride and 25.0g of sodium chloride are mixed. Write the reaction, identify the excess reactant, and identify the limiting reactant.

Today you will review precipitation reactions by observing what happens when a solution of sodium chloride is added to a solution of silver nitrate.  You will create a video lab report that details the process and provides multiple pictures of the reaction along with detailed diagrams/drawings that show what is happening on a molecular level.

The lab portion:

1. Wear goggles.  Silver nitrate is bad if it gets in your eyes. Wash your hands.

2. Use your test tube holder and one of the large test tubes on the center table.

3. Add a full pipet of silver nitrate and then fill the rest with DI water.

4. Add a full pipet of the sodium chloride (it is very concentrated to make the reaction happen quickly) to the test tube.  Be ready to film/take pictures.  Lots and lots of them.

5. Let the reaction sit until it looks like milk.  Dump down the drain with lots of water.  Soap and water to clean up the test tube.

The video portion:

1. An introduction to the reaction and concept of precipitation.  The balanced reaction should be included.

2. Detailed drawings of what is starting to happen right when you add the NaCl.

3. Detailed drawings of what is happening as the precipitate forms and you can start to see it.

4. Discuss the 'time lapse' and what is happening at the molecular level (ie. Why doesn't it all instantly go white?  Why does it take a little while?).

5. The final product.