When crystals touch the liquid surface it rapidly starts freezing.
name: Sodium thiosulfate crystallizes from supercooled state.
Crystallization of supersaturated sodium thiosulfate
Super Saturated Solutions :0
Chemistry experiment 20 - Growing sodium thiosulfate crystals
Supersaturated Solution Demo
Sodium thiosulphate crystalization
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Na2S2O3(melt) → Na2S2O3 (solid)
- To perform this experiment you should prepare sodium thiosulfate.
- Fill the test tube with sodium thiosulfate.
- Heat it in a water bath until it melts.
- Pour liquid into the Petri dish.
- Wait for it to cool.
- To start freezing add some crystals of sodium thiosulfate to the liquid or touch the liquid with a stick.
Sodium thiosulfate is a white crystalline solid at room temperature. Its melting point is 48.3 °C. When sodium thiosulfate is heated in a water bath it melts. After this it is cooled down but the substance still exists in a liquid state. This phenomenon is called supercooling. The supercooled state is very unstable. When some kind of disturbance is introduced to the system sodium thiosulfate rapidly freezes and become solid.