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Answer: 156 should If the 456 used under the filled it would been permitted but If even smallest amount possible for your experiments.
Explanation: Even when something does have to be thrown away, such as an old printer, it can often be recycled. Many things can have another use later, but only if recycled. This helps protect resources. Most labs you will do in this course will not involve hazardous waste. However, it is important that you follow any rules your school has about disposing trash.
Here are a few guidelines for disposing of waste in the lab:
1 – Separate waste into compatible groups. You don’t want to mix two chemicals that might cause an explosion.
2 – Use only glass or polyethylene (a special kind of plastic) containers for chemical waste. Regular plastic or metal can melt.
3 – Label every waste container properly. Each container should have:
•a red hazardous waste sticker.
•a label stating what kind of waste is inside of it.
4 – Store hazardous waste in a safe, explosive-proof cabinet, away from drains or sinks.
5 – Do not store hazards next to materials that could explode when mixed.
A hazardous waste container
6 – Bottles of waste should always be capped.
7 – Other items besides chemicals require special attention at garbage time. Sharp tools, like knife blades, should be wrapped carefully, and the wrapping should be taped closed. If there is a safety container provided, dispose of the blades in that container.
Glass should also be wrapped in paper or put into a plastic container before disposal. There should be a separate place to dispose of glass. Glass used in a lab might be contaminated with chemicals and need to go to a hazardous waste management center.
Drains can easily be clogged, so always get permission before pouring anything down a drain in your lab. Something as harmless as chocolate could harden inside the pipes and back up the whole system. Never pour chemicals down the drain unless they are properly diluted and permission is given first.