Next the crucible and lid plus the hydrate inside was placed back again under

Next the crucible and lid plus the hydrate inside was

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Next, the crucible and lid plus the hydrate inside was placed back again under the Bunsen burner. While the crucible was being heated, the bottom of it was bright red. The hydrate was still solid once the lid was taken off, but it looked like it was losing the H 2 O because the sides seemed to be lifting from the crucible. The crucible and the lid were then taken off of the Bunsen burner to cool and then be weighed, measuring the loss of mass from the evaporation of H 2 O. These steps were repeated one more time. The measurements were recorded in Table 1. Table 1: Measurements of all objects used for the calculation of the chemical formula ofBaCl 2 · H 2 O. Measurement Mass (g)
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Mass of clean crucible + lid 27.68 g Mass of crucible + lid + hydrate 30.88 g Starting Mass of hydrate 2.990 g Final mass of crucible + lid + hydrate 30.40 g Mass remaining after heating hydrate 2.576 g Mass lost upon heating the hydrate .4800 g Table 2: Analysis to determine chemical formula of hydrate of BaCl 2 · H 2 O. Determination Value Mass of anhydrous BaCl 2 sample 2.990 g Mass of water in original hydrate .4800 g % by mass of H 2 O in original hydrate 16.05% Mass of sample used for analysis 2.576 g
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