Electrochemistry · Grade 11
Electrolysis of salt water
ChemAI · Worksheet
NameClassDate
Aim
Hydrogen, chlorine and an alkaline solution from brine.
⚠ Chlorine is toxic. In a real lab this is done in a fume cupboard.
Before you start: what do you predict will happen? Why?
What you do
| Step | What I observed | |
|---|---|---|
| 1 | Switch on the electrodes and watch both electrodes. | |
| 2 | Why does the phenolphthalein turn pink? | |
| 3 | Test with a burning splint. | |
| 4 | Test with damp litmus paper. |
Questions
- Write a word or symbol equation for one reaction you observed.
- Explain your most important observation using particles, ions or energy.
- Was your prediction right? What would you change to get a more reliable result?