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Sodium carbonate decahydrate is the name of the compound Na2CO3·10H2O, because 'deca' means 'ten'.

The term hydrated sodium carbonate is commonly used to encompass the monohydrate (Na2CO3·H2O), the decahydrate and the heptahydrate (Na2CO3·7H2O).

Both the hepta- and the decahydrate are partially transformed into the monohydrate thermonatrite Na2CO3·H2O when left over in dry air.

Anhydrous (no H2O) sodium carbonate (Na2CO3) is formed when heating Na2CO3·H2O or NaHCO3 or Na3H(CO3)2·2H2O (trona) up to 150o-200oC (this is called calcination).

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โˆ™ 13y ago
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โˆ™ 6mo ago

The chemical formula for sodium carbonate decahydrate, Na2CO3ยท10H2O, indicates that each formula unit of sodium carbonate is associated with 10 water molecules. This specific ratio of water molecules to sodium carbonate ions is due to the way the compound forms and crystallizes in its solid state.

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Q: Why only 10H2O in sodium carbonate deca hydrate?
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