Answer :
Final answer:
The answer to the student's question is option b) Preventers. Backflow preventers are vital in protecting sumps/ejectors from contamination due to back-suction in systems such as vacuum traps or when using devices like water aspirators.
Explanation:
All sumps/ejectors should be protected by backflow preventers. The correct answer to this question is option b) Preventers. Protecting sumps and ejectors with backflow preventers is crucial to prevent the unintended reverse flow of liquids into the clean water supply, which can be potentially hazardous. A vacuum trap, for example, is necessary when connecting apparatus to vacuum sources to prevent such backflow. This is particularly important when utilizing a water aspirator, as changes in pressure can cause back-suction, which might lead to contaminants being drawn into the vacuum line and flask or the water supply.
In the context of a separation or distillation process, it's essential to cool the system first before allowing air back in to avoid reactions with residual substances in the flask. A vacuum trap serves to prevent any back-suction when the vacuum source is turned off as part of standard procedures, such as after suction filtration, ensuring the distillate or filtrate remains uncontaminated.
A device like a ball valve allows liquid to flow in just one direction. It comprises a ball connected to a spring, which is designed to block the reverse flow of liquid, thus functioning as a type of backflow preventer.
