Many compounds exist as hydrates. Observing our nitrate, it has a white crystalline structure, representing that similar to table salt. 7H 2 O. The chemical formula is CH3OH. They may be used as water indicators. Formula of the hydrate: MgSO4 • 4H2O. For example, a hydrate of cadmium sulfate seems to have 2. Purpose. 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. The notation "hydrated compound⋅nH 2 O", where n is the number of water molecules per formula unit of the salt, is commonly used to show that a salt is hydrated.The n is usually a low integer, though it is possible for fractional values to occur. Kimberly Graziano & Hyunjae Kim. Ratios vary in different hydrates but are specific for any given hydrate. 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. 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. The formula of a hydrate is represented in a special manner. Its formula is CuSO 4 5H 2 O. nH 2 O, is heated to drive off the water. pentahydrate is an example of such a hydrate. An example of an organic hydrate is ethanol, which is also known as ethyl 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}): Inorganic hydrates are often salts and crystals that may change colors when the water molecules are driven off. The water is chemically combined with the salt in a definite ratio. Also, write the name of the hydrate of manganese sulfate. After heating, 4.26 g of anhydrous barium chloride, BaCl 2, remains.What is the value of n in the hydrate's formula? A colorful example is cobalt(II) chloride, which turns from blue to red upon hydration, and can therefore be used as a water indicator.. Hydrate Lab. Example #1: A 15.67 g sample of a hydrate of magnesium carbonate was heated, without decomposing the carbonate, to drive off the water. Solution: 1) Calculate moles of anhydrous barium chloride: Determine the formula of a hydrate: Fifteen Examples. 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 can be determined by dehydrating a known mass of the hydrate, then comparing the masses of the original hydrate and the resulting anhydrous solid. 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