pentahydrate

[ pen-tuh-hahy-dreyt ]

noun

, Chemistry.

1. a hydrate that contains five molecules of water, as potassium molybdate, KMoO 4 ⋅5H 2 O.

Other Words From

• penta·hydrat·ed adjective

Word History and Origins

Origin of pentahydrate¹

First recorded in 1915–20; penta- + hydrate

Example Sentences

The pentahydrate is deposited between 79� C. and 56� C.; below this temperature the decahydrate or ordinary borax, Na2B4O7�10H2O, is deposited.

From Project Gutenberg

From a supersaturated aqueous solution of borax, the pentahydrate, Na2B4O7�5H2O, is deposited when evaporation takes place at somewhat high temperatures.

From Project Gutenberg