# Hemihydrate

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Solid substance containing one water molecule per two unit cells

In [chemistry](/source/Chemistry), a **hemihydrate** (or **semihydrate**) is a [hydrate](/source/Hydrate) whose solid contains one [molecule](/source/Molecule) of [water of crystallization](/source/Water_of_crystallization) per two other molecules, or per two [unit cells](/source/Crystal_structure#Unit_cell). This is sometimes characterized as a solid that has one "half molecule" of water per unit cell.[1] An example of this is [calcium sulfate hemihydrate](/source/Calcium_sulfate_hemihydrate) (CaSO4·0.5H2O or 2CaSO4·H2O), which is the hemihydrate of [calcium sulfate](/source/Calcium_sulfate) (CaSO4).

## References

1. **[^](#cite_ref-1)** Kent, James A. (2007-10-08). [*Kent and Riegel's Handbook of Industrial Chemistry and Biotechnology*](https://books.google.com/books?id=zPZWYerB3SYC). Springer Science & Business Media. p. 1096. [ISBN](/source/ISBN_(identifier)) [978-0-387-27842-1](https://en.wikipedia.org/wiki/Special:BookSources/978-0-387-27842-1).

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