Hazards:
Use care when handling 6M HCl and 6M NaOH. They are both corrosive and toxic.
Chemicals and Solutions:
0.1M Cu(SO4) Copper sulfate
Dilute(approx. 2%) or conc. Ammonium chloride
6M Hydrochloric acid
6M Sodium hydroxide
Materials:
2 small hydrometer cylinders
2 stirring rods
Procedure:
Follow the table below for each solution.
Iron (III) sulfate |
Copper sulfate |
|
Starting color: |
clear rustish |
clear pale blue |
Add 1 part 2% ammonia |
gelatinous rustish |
powder blue ppt to dark blue |
+1 part 2% ammonia |
still gelatinous rustish |
dark blue to super blue |
Add 1part 6M HCl |
yellow |
pale blue |
+1part 6M HCl |
yellow |
blue/green |
+1part 6M HCl |
yellow |
green/blue |
+1part 6M HCl |
yellow |
green |
Hint:
Discussion:
Substances that can act as either acids or bases are descibed as amphoteric.
To schedule a demonstration, please send an email to the demonstration lab.
Contact:
Eric Camp
Lecture Demonstration Technician
Bagley Hall 171
(206) 543-1606