Predict Before You Crystallize
Select a salt above, then predict what its crystals will look like and why. The procedure stays locked until you commit a prediction.
Select a salt to enable prediction.
Select a Salt to Begin
1️⃣
Dissolve
Dissolve salts in water
2️⃣
Mix
Combine solutions
3️⃣
Concentrate
Heat to reduce volume
4️⃣
Crystallize
Cool for crystal formation
Reaction Vessel
Waiting...
Lab Journal — Observation vs Interpretation
Select Mohr's salt or Potash alum...
⚠️ Safety — Double Salt Preparation
- Dilute sulfuric acid (Mohr's salt): corrosive — add acid to water, never the reverse, and wear goggles. It is used to stop Fe²⁺ hydrolysing and oxidising.
- Heating solutions: concentrate gently and do not boil to dryness; hot glassware and bumping liquid can scald. Use tongs and point the vessel away from you.
- Aluminium / potassium sulfate & ferrous sulfate: irritant to skin and eyes — avoid contact and wash hands after handling.
- Crystallisation: let solutions cool slowly and undisturbed; do not force-cool hot glass in cold water (thermal shock can crack it).