The mass of water evaporated is obtained by subtracting the mass of the anhydrous solid from the mass of the original hydrate ( 2.12.3 ): (2.12.3) m H 2 O = m Hydrate − m Anhydrous Solid.The flask is then placed in boiling water, where the liquid will vaporize completely, driving out the air and A small amount of the liquid is introduced into a weighed flask. This experiment involves measuring the gram-molecular weight of a volatile liquid by using the above equation.
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