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Water of Hydration


Submitted By CROY
Words 1295
Pages 6
Experiment No. 5

I. Objectives 1. To be able to identify and know the different properties of hydrates. 2. To observe and test the reversibility of hydration reaction. 3. To test and compare substance for efflorescence and deliquescence. 4. To determine the percent water in a hydrate.

II. Results and Discussions
According to Hamak, Hydrates are ionic compounds (crystalline salts) that are bonded to water molecules thus having a definite amount of it as part of their structures. This “water of hydration” is released as vapor when the hydrate is heated in which it loses water and become dehydrated (anhydrous). The remaining solid is known as the anhydrous salt. The general reaction for heating a hydrate is: A. Identification of Hydrates Compounds of Nickel Chloride (NiCl2), Potassium Chloride (KCl), Sodium Tetraborate or Borax (Na2B4O7·10H2O), Sucrose (C12H22O11), Potassium dichromate (K2Cr2O7) and Barium Chloride (BaCl2) each in about 0.5 grams were heated on a Bunsen flame and their behavior was then observed specifically determining whether one is a hydrate. Refer to TABLE 1.

Fig.1. Unheated Compounds TABLE 1. Summary and analysis of the results pertaining to the tested compounds | BEFORE HEATING | DURING HEATING | AFTER HEATING | | | | Properties of Compounds | Appearance of Water | Color of Residues | Water solubility and its color | Hydrates or Not? | Nickel Chloride (NiCl2), | -Green in color-Liquid state | Yes | Yellow Green | -Soluble-Green | A Hydrate | Potassium Chloride (KCl), | -White-Crystalline powder | No | White |

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