- Evaporation and crystallisation are the processes of heating a hydrous salt until all the water evaporates, followed by calculating the mass of water lost.
- This technique is commonly used in chemistry to determine the water of crystallisation in salts.
Procedure
1. Gentle Heating
- Use an electric heater to heat the salt gently.
- Gentle heating prevents the decomposition of crystals and ensures a high percentage yield.
2. Weighing at Intervals
- Heat and weigh the mass of solid crystals at regular intervals.
- Continue until the mass becomes constant, indicating that all water has evaporated.
Key Insight
- The constant mass confirms that complete evaporation has occurred.
- This method ensures accurate determination of the amount of water of crystallisation present in the salt.
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