copperas

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copperas:

the heptahydrate of ferrous sulfateferrous sulfate
or iron (II) sulfate,
chemical compound, FeSO4. It is known as the monohydrate, FeSO4·H2O; the tetrahydrate, FeSO4·4H2O; the pentahydrate, FeSO4·5H2
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copperas

[′käp·ə·rəs]
(inorganic chemistry)