What is the purpose of the trap in Figure 2-17 and the watchglass in Figure 2-20? Figure

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What is the purpose of the trap in Figure 2-17 and the watchglass in Figure 2-20?

Figure 2-17

Gooch filter crucible To air -Rubber adaptor -Glass funnel To house vacuum Porous glass Gooch filter crucible Suction flask Trap


Figure 2-20

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