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:
\( \ce{ HCl_{(aq)} + NaOH_{(aq)} -> NaCl_{(aq)} + H2O_{(l)} } \)
\( \ce{ H2SO4_{(aq)} + 2NaOH_{(aq)} -> NA2SO4_{(aq)} + 2H2O_{(l)} } \)