Titration of Mono- and Di-Protic Acids

 

 

Summary: 

This demonstration can also be used  to compare monoprotic and diprotic acids.

Hazards: 

The solutions in this demonstration can cause burns.  Avoid contact.

Chemicals and Solutions: 

1M HCl

1M H2SO4

1M NaOH

Thymol blue indicator

Materials: 

Two (size) burets

Two 125mL erlenmeyer flasks

One 100 mL graduated cylinder

Procedure: 

Add several drops of thymol blue indicator to each of the acid solutions and the base solution.  Fill each buret with  an acid and label them accordingly. Measure out 40 mL of NaOH solution into each of the erlenmeyer flasks.  Titrate the NaOH with each acid (the equivalence point is yellow).

 

Discussion: 

This demonstration shows the stoichiometry of the following reactions:

HCl(aq) + NaOH(aq) è NaCl(aq) + H2O(l)

H2SO4(aq) + 2NaOH(aq) è Na2SO4(aq) + 2H2O(l)

 

 

 

 

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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