It describes the absence of water in a compound. Some ionic compounds are coordinated to a specific number of water molecules in solution. Upon heating, the water can be evaporated leaving an anhydrous salt. How can we find out? 2. An unknown hydrate ac xH2O has a mass of 1.632 g and the anhydrous compound AC has a mass of 1.008 g What is the experimental percentage of water in the hydrate… What does hexahydrate mean? If you don t convert the hydrate into a anhydrous how does it affect the mass percent of water in the compound? Explain how this would effect: a) The calculated percent by mass of water in the compund. Most hydrates are stable at room temperature. 7. How can you convert a hydrate to an anhydrous compound? If I didn’t completely convert the hydrate to the anhydrous compound, the calculated percent by mass of water int hecompound would be less. For example, the anhydrous compound cobalt(II) chloride is blue, while the hydrate is a distinctive magenta color. Interestingly, it is common for the hydrated form of a compound to be of a different color than the anhydrous form, which has no water in its structure. We can't see molecules! Any anhydrous compound from a hydrate generally has the following properties: Highly soluble in water; When dissolved in water, the anhydrous compound will have a color similar to that of the original hydrate even if it had changed color going from the hydrate to the anhydrous compound. By heating it to convert the associated water to a gas. The dot in the formula indicates that the two compounds are bound together. 4. Heating a compound can drive off the H 2 O leaving an anhydrous (without H 2 O) compound. These compounds are known as anhydrous compounds. What is the % H 2 O in MgSO 4 • 7 H 2 O Answers 1. 3. Answers 1. When separated from a water solution cuso4 forms a hydrate with 5 water molecules per formula unit if 44 g of anhydrous cus04 are dissolved in water Anhydrous means that it does not contain any free water, while hydrates are compounds with water formed with cations. But how many? Six water molecules are attached to the compound. Suppose that you did not completely convert the hydrate to the anhydrous compound. Of course this also leads to the difference in molecular weight. b. the chemical formula you determined. 3. A hydrate is a compound that has one or more water molecules bound to each formula unit. 2. Explain how this would affect a. the calculated percent by mass of water in the compound. The water in a hydrated compound is called the water of hydration. Anhydrous is a term used to explain a substance that does not contain water as a constituent. We can obtain anhydrous compounds through different techniques. Then you can easily find the moles of each element and find the ratio. 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