Acid Base Properties of Salts
Recommended for Chapter(s): 7
Demo #025
Materials NOT in box
1. Safety goggles.
Procedure
1. Pour 60 mL of each of the solutions into separate 100 mL beakers.
2. Ask students to predict if the solution is acid, basic, or neutral.
3. Write the following chart on the board
Color PH
Red 2
Red-Orange 3
Orange 4
Orange-Yellow 5
Yellow 6
Green 7
Green-Blue 8
Green-Violet 9
Violet 10
4. Put 1 dropper full of universal indication into each of the beakers to identify the pH.
a. 0.1 M KI solution should turn green (pH= 7.0 neutral).
b. 0.l M NH4Cl solution should turn orange (pH = 4.6 acidic).
c. 0.1 M NaHSO3 solution should turn red-orange (pH = 4.5 acidic).
d. 0.1 M NH4C2H3O2 solution should turn green (pH = 7.0)
e. 1.0 M NaC2H3O2 solution should turn blue-green (pH = 8.9 basic)
Safety
1. Wear safety goggles.
Clean Up
1. Pour all solution in waste bottle.
2. Return the materials to the cart in the demonstration library room.
Stockroom Notes
1. Empty waste bottle down the drain with plenty of water.
2. Replace glassware with clean glassware.
3. If needed refill any material that is used up.
