When 2 monosaccharides are put together or covalently bond together there is only 1 water molecule that is formed as a result. The hydrogen group or hydrogen atom from one of the monosaccharide is removed and also the Hydroxyl of another monosaccharide is removed through the formation of the glycosidic bond. The 2, then form a molecule of water as the Oxygen in the hydroxyl bonds to the hydrogen with its valence electrons forming water.
