Amphoteric Nature of Copper Sulfate

 

 

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.

Add to each beaker

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

ericcamp@uw.edu

 

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