from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A hydrate whose solid contains seven molecules of water of crystallization per molecule, or per unit cell

from The Century Dictionary and Cyclopedia

  • n. In chem., a compound containing seven molecules of water, as common copperas in crystals, or ferrous sulphate heptahydrate (FeSO4.7H2O).


from Wiktionary, Creative Commons Attribution/Share-Alike License

hepta- +‎ hydrate


  • [46] Green vitriol, ferrous sulphate heptahydrate, a compound of iron, sulphur, and oxygen, crystallised with seven molecules of water, represented by the formula FeSO4.

    Bygone Beliefs

  • Green vitriol is a heptahydrate of iron (II) sulfate or ferrous sulfate.

  • Another struggles with the simple inorganic salts required to make up buffer solutions, ortho, dihydrate, heptahydrate, anhydrous.

    Lecturer Notes

  • Sodium carbonate has three known forms of hydrates: sodium carbonate decahydrate (natron), sodium carbonate heptahydrate (not known in mineral form) and sodium carbonate monohydrate (mineral thermonatrite).

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  • It most commonly occurs as a crystalline heptahydrate which readily effloresces to form a white powder, the monohydrate.

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  • A stock solution of trace elements was prepared that contained the following (in mg/l): Zinc sulphate (heptahydrate), 143.77; Magnesium chloride

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