Water and solutions · Grade 9
Purple crystal: dissolving and dilution
ChemAI · Worksheet
NameClassDate
Aim
Each 1 mL into 9 mL is a tenfold dilution.
Before you start: what do you predict will happen? Why?
What you do
| Step | What I observed | |
|---|---|---|
| 1 | Drop a potassium permanganate crystal into tube 1. | |
| 2 | Set the amount to 1 mL, then pour from tube 1 into tube 2. | |
| 3 | Pour 1 mL from tube 2 into tube 3. | |
| 4 | Pour 1 mL from tube 3 into tube 4. Tube 4 is 1000 times more dilute than tube 1. |
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?