Set hot crucibles on to wire screens to cool. Use of eye protection is recommended for all experimental procedures.Ī hot crucible will break if placed directly on a cold surface. Section 2: Safety Precautions and Waste Disposal On the other hand, an anhydrous salt (without water) can absorb water from the atmosphere and spontaneously dissolve in its own water of hydration (deliquescent).Ī hydrate contains a definite number of water molecules bound to each ionic compound or anhydrous salt. In this experiment, students will dehydrate an unknown hydrate sample by heating, and calculate the amount of water lost in the process. Students will determine the ratio between the moles of water lost and the moles of anhydrous salt and write the chemical formula of the hydrate sample. Hydrates are ionic compounds that contain water molecules as part of their crystal structure. The bound water is called the water of hydration. Some compounds lose this water of hydration spontaneously (efflorescent) while some may require heating. Introduction to forms of matter with example of ionic hydrates.Introduction to quantitative analysis: determination of proportions of subunits in a chemical sample.\)ĭetermine the percent water of hydration in a hydrate sample.ĭetermine the number of moles of water, x, per mole of anhydrous salt and write the chemical formula of the hydrate sample. ![]() ![]()
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