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Sodium Hypophosphite: Calcium Hypophosphite and Soda
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Leiem (Wikimedia Commons) · CC BY-SA 4.0
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Sodium Hypophosphite: Calcium Hypophosphite and Soda

Sodium hypophosphite is the reducing agent of electroless nickel plating. US Dispensatory (1907): mix solutions of calcium hypophosphite and soda; chalk falls out and sodium hypophosphite stays in solution. Filter and evaporate. It has exploded when evaporated hot: keep it well below 100 °C, behind a face shield, and away from nitrates and chlorates. The picture: sodium hypophosphite crystals (Wikimedia Commons).
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Calcium Hypophosphite: Phosphorus Boiled with Milk of Lime, Procter
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Calcium Hypophosphite: Phosphorus Boiled with Milk of Lime, Procter

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