Determination of Water of Hydration with an Ohaus(R) Balance Classroom Kit Clearance

 

In this exercise you will perform the procedure to determine the water of hydration using a known hydrate. You will then repeat the procedure on two unknown hydrates and use your experimental data to calculate the waters of hydration for each of the unknowns.

As a final step, you will add an anhydrous salt to water and monitor the reaction for temperature change. Based on temperature data, you will arrive at a conclusion regarding either the exothermic or endothermic nature of both dehydration and hydration reactions. This kit is designed for 15 set-ups.

Materials included in the kit:

• 1 x 25 g Copper(II) sulfate, pentahydrate (CuSO4x5H2O)
• 1 x 25 g Cobalt(II) chloride, hexahydrate (CoClx6H2O)
• 1 x 25 g Magnesium sulfate, heptahydrate (MgSO4x7H2O)
• 1 x 25 g Calcium chloride, anhydrous
• 45 Glass vials

Materials needed but not supplied:

• Ohaus Scout Pro electronic balance (Ohaus item #SPE123)
• Bunsen or alcohol burners
• Test tube holder or similar
• Beakers, 50 ml
• Thermometers
• Distilled water