Percent Water in a Hydrated Salt Lab-Lab Report

Percent Water in a Hydrated Salt Lab-Lab Report - Percent...

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Percent Water in a Hydrated Salt Abstract The percent by mass of water in the hydrate of magnesium sulfate and the empirical formula of the hydrate were determined using the gravimetric analysis. The mass percent was found to be 49.73 %. The number ratio of the waters of crystallization to the formula unit of magnesium sulfate was calculated to be 7. This reveals that the empirical formula of the hydrate is MgSO 4 ●7H 2O . Keywords magnesium sulfate, hydrate, percent water, formula Introduction Many salts occurring in nature or manufactured are hydrated, such as FeCl 3 ·6H 2 O, CuSO 4 ·5H 2 O, and MgSO 4 ·7H 2 O. For some hydrated salts (i.e. MgSO 4 ·7H 2 O), the water molecules are loosely bound to the ions that heat removes them to form the anhydrous salt. Therefore, the number of water molecules bound to the ions of the salt in its crystalline structure may be determined by a gravimetric analysis, an analytical method that relies on mass measurements, on a gentle heating process. In this experiment, an unknown hydrated magnesium
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Percent Water in a Hydrated Salt Lab-Lab Report - Percent...

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