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Pentahydrate
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Wiktionary, Creative Commons Attribution/Share-Alike License
n.
A hydrate whose solid contains five molecules of water of crystallization per molecule, or per unit cell
Word Usage
"Make a Glowstick Ingredients: 2 liters distilled water, 50 milliliters hydrogen peroxide (3 percent concentration), 0.2 gram luminol, 4 grams sodium carbonate, 0.4 gram copper sulfate pentahydrate, 0.5 gram ammonium carbonate."