DominiqueSylvia

In order to identify hydrate 3, a cool crucible was placed on a scale and was measured. Two teaspoons of hydrate 3 was added to the crucible and was measured. By subtracting the mass of the crucible from the combined mass of the crucible and hydrate, the mass of the hydrate was determined. The crucible containing the hydrate was placed over a burner on a crucible stand, which was on, and left there until vapors appeared. After a few minutes, when no more vapors were to be seen, the hydrate was removed, assuming that the water had evaporated, making the hydrate, an anhydrate. After letting the crucible cool down, it was put on the scale and measured. The weight of the crucible with the anhydrate was subtracted from the mass of the crucible to get the mass of the anhydrate. That number was then subtracted from the mass of the original hydrate. The percent of mass water in hydrate was then calculated. The formula for this is //mass of water lost divided by mass of hydrate.// the hydrate was determined to be Magnese Sulfate Monohydrate, which has a percent mass of water of 51%.