Silver nitrate stains fingers
Potassium hydroxide is caustic and toxic
Ammonia is caustic and has irritating vapors
The greatest is hazard is formation of silver fulminate. To avoid formation of silver fulminate dispose of the Tollens' test immediately after performing the experiment.
Chemicals and Solutions:
Tollens' Solution A (dilute sugar/acid)
Tollens' Solution B (potassium hydroxide, silver nitrate, ammonia)
500 ml test tube and rack
Add 6 mL of Tollens' Solution A to the large test tube.
Pour in 400 mL of Tollens' Solution B. Within a minute the tube should darken and begin to form a silver mirror.