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Natron
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=== As a source of soda ash === Sodium carbonate decahydrate is stable at room temperature but recrystallizes at only {{convert|32|°C|°F|abbr=on}} to sodium carbonate heptahydrate, Na<sub>2</sub>CO<sub>3</sub>'''·'''7H<sub>2</sub>O, then above {{convert|37|-|38|C|F}} to sodium carbonate monohydrate, Na<sub>2</sub>CO<sub>3</sub>'''·'''H<sub>2</sub>O. This recrystallization from decahydrate to monohydrate releases much crystal water in a mostly clear, colorless salt solution with little solid [[thermonatrite]]. The mineral natron is often found in association with [[thermonatrite]], [[nahcolite]], [[trona]], [[halite]], [[mirabilite]], [[gaylussite]], [[gypsum]], and [[calcite]]. Most industrially produced sodium carbonate is soda ash (sodium carbonate anhydrate Na<sub>2</sub>CO<sub>3</sub>) which is obtained by calcination (dry heating at temperatures of 150 to 200 °C) of sodium bicarbonate, sodium carbonate monohydrate, or [[trona]].
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