Some examples are copper (II) sulfate, sodium sulfate, nickel (II) sulfate, iron (II) sulfate, cobalt (II) chloride, magnesium sulfate, sodium carbonate, calcium sulfate, sodium acetate, and barium chloride. A colorful example is cobalt(II) chloride, which turns from blue to red upon hydration, and can therefore be used as a water indicator.. An example of an organic hydrate is ethanol, which is also known as ethyl hydrate. The mass was reduced to 7.58 g. What is the formula of the hydrate? After heating, 4.26 g of anhydrous barium chloride, BaCl 2, remains.What is the value of n in the hydrate's formula? Purpose. pentahydrate is an example of such a hydrate. Solution: 1) Calculate moles of anhydrous barium chloride: The chemical formula is CH3OH. The formula of a hydrate can be determined by dehydrating a known mass of the hydrate, then comparing the masses of the original hydrate and the resulting anhydrous solid. Example #1: A 15.67 g sample of a hydrate of magnesium carbonate was heated, without decomposing the carbonate, to drive off the water. Kimberly Graziano & Hyunjae Kim. The purpose of this lab is for students to dehydrate a hydrate and use the mass data obtained in lab to calculate the number of moles of water that were attached to the hydrate. The mass of water evaporated is obtained by subtracting the mass of the anhydrous solid from the mass of the original hydrate (\ref{3}): 7H 2 O. List of Hydrate Compounds, Common Compounds of Hydrate H2O$, Formula, Molecular Weight The five in front of the formula for water tells us there are 5 water molecules per formula unit of CuSO 4 (or 5 moles of water per mole of CuSO 4). The formula of a hydrate is represented in a special manner. They may be used as water indicators. The water is chemically combined with the salt in a definite ratio. Hydrate Lab. Experimental Question: How can we experimentally determine the formula of an unknown hydrate, A? nH 2 O, is heated to drive off the water. Its formula is CuSO 4 5H 2 O. Example #2: A hydrate of Na 2 CO 3 has a mass of 4.31 g before heating. Testable Prediction: Our unknown hydrate may be a hydrate of copper(II) sulfate, magnesium sulfate, iron(III) chloride, or iron(III) nitrate. Given that a 139.4-g sample of hydrated MnSO 4 is reduced in mass to 94.38 g upon heating find the empirical formula of the hydrate. Virtual Lab: Formula of a Hydrate Background: Hydrates are ionic compounds (salts) that have a definite amount of water (water of hydration) as part of their structure. Formula of the hydrate: MgSO4 • 4H2O. Observing our nitrate, it has a white crystalline structure, representing that similar to table salt. Inorganic hydrates are often salts and crystals that may change colors when the water molecules are driven off. For example, a hydrate of cadmium sulfate seems to have 2. 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