DESCRIPTION:
This demonstration makes a white precipitate by mixing equal amounts of silver nitrate and potassium chloride:
AgNO3 (aq) + KCl (aq) → KNO3 (aq) + AgCl (s)
TOPICS COVERED:
– double replacement reactions
– precipitate reactions
– color change
– chemical change
– solubility
MATERIALS NEEDED:
– 0.2M AgNO3
– 0.2M KCl
– small beaker
– disposable pipets
PROCEDURE:
1. Add a few mL of silver nitrate to the beaker
2. Add a few mL of potassium chloride to the beaker
ADDITIONAL COMMENTS:
This is a great one for students to do.
SAFETY:
Safety goggles should be worn at all times.
This lesson plan‘s topic is the Evidences of Chemical Reactions. Students learn the various evidences, then they get a change to practice identifying them with a hands on activity. Colorless to White is used in the activity portion of this lesson.