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Once the crucible has cooled, using the tongs so that you do not alter the weight of
the crucible from the oils of your skin,
transfer the crucible to a measuring scale
and obtain the mass. Before placing your crucible onto the measuring scale,
make sure the measuring scale is zeroed out by pressing the zero button.
Carefully place your crucible onto the measuring scale plate.
Allow enough time for
an accurate reading. Next, weigh out 2 to 3 grams of
unknown directly into each of the crucibles. Record the masses in grams
onto your report sheet.
Again, make sure your cap is secure. Take this number
and record it to your report sheet. Repeat this procedure with your second
crucible.