Place hook shaped spacers, which you can make by folding a small piece of aluminum foil (available in the lab) about 2" long, around the rim of the beaker and cover it with a watch glass, as shown in Figure 6.
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spacers, which you can make by folding a small piece of aluminum foil (available in the lab) about 2" long, around the rim of the beaker and cover it with a watch glass,
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a small piece of aluminum foil (available in the lab) about 2" long, around the rim of the beaker and cover it with a watch glass