Lab+safety

​ UNIT I: SAFETY IN THE CHEMICAL LABORATORY

Do not wait to ask your teacher's permission to use any emergency equipment when necessary!!! A student on FIRE must "__stop. drop and roll__"

A. Fire equipment www. google.com/image When to use fire extinguishers? - the fire is uncontrolled and small enough to be put out with a fire extinguisher.

How to use fire extinguishers? Remember the "PASS" P pull the pin A aim the extinguisher nozzle at the base of the blames S Squeeze trigger while holding the extinguisher upright. S Sweep the extinguisher from side to side, covering the area of the fire with the extinguisher agent.

Key points: - large extinguisher: spray for about 20s - small extinguisher : spray for about 10s. - the distance should be 4-5 m in order to be effective and safe.

B.Fire Blanket [|image.made-in-china.com/2f0j00kBFQaEICOTgy/EN1869-Fire-Blanket.jpg] When to use fire blanket? - a student's clothing or hair catches fire. - smother burning material on the floor or a bench.

How to use fire blanket? 1. pull the blanket out of the case. Hold the blanket by tabs and move cautiously toward the object that is on fire. 2. drape the fire blanket compeletely over the object. 3. allow the blanket to remain in place for at least 30 minutes.

Key points: - for small fires, a fire blanket is a safety device which is useful. - a fire blanket works by cutting off the supply of oxygen to a fire. - protect hands from the fire while using a fire blanket: wrap them in the top edge of the blanket as putting the blanket on the flame. - after using, fire blankets should be allowed to cool for at least 30 minutes.

C.Eyewash fountain or eyewash station [|img.directindustry.com/images_di/photo-g/eyewash-station-371383.jpg] When to use eyewash fountain or eyewash station? - any time a chemical or solution gets into eyes.

How to use eyewash fountain or eyewash station? - push the vertical paddle back with your hands and put your face down into the stream of water. - keep your eye open in the stream of water, blinking rapidly to help wash underneath the lids. - keep washing the eyes for at least 5 minutes.

Keypoints: - the emergency eyewash station is only for first aid. It is not medical treatment for chemical exposures. - contact lenses must be removed for proper cleaning. - If eyes are being washed in the eyewash fountain or with the eyewash bottle, you feel a foreign object in your eyes, the first aid should be attemped to remove the object.

D.Emergency Shower [|www.vieus.com.my/ppe/ppe%20Emergency%20Shower.jpg] When to use emergency shower? - when hazardous chemicals spray over large areas of the body.

How to use emergency shower? - stand under the shower head and pull down on the ring or turn the on-off handle and hold the shower head. - If a hazardous liquid chemical or solution soaks into the clothing, the effected clothing must be removed after the washing process.

Keypoints: - the emergency shower is only for first aid. It is not medical treatment for chemical exposure. - any clothing removed should be thoroughly washed before begin put on again.

What is substance is in the emergency shower? - like regular shower equipment, the emergency shower can provide soft flow of water.

E.Acid-Base Neutralizing Solutions When to use acid-basic neutralizing solutions? - whenever an acidic or basic ("caustic") solution has come in contact with your skin.

How to use acid-basic neutralizing solutions? - wash the affected area with water - pour some of the neutralizing solution on the affected area and wash the skin with the solution. - after washing with the neutralizing solution, continue to wash with warm soapy water.

Keypoints - do not use acid-base neutralizing solution in your eyes! - teh solution usually consists of a dilute solution of sodium acetate and acetic acid

Other references: - Hebden Chemistry 11 - www.google.com - www.wikipeida.com