Users' questions

Which is always the first step in dealing with an accident in the lab?

Which is always the first step in dealing with an accident in the lab?

Call the emergency number, 911.

How do I know if my fume hood is working?

Testing ProcedurePosition the sash so that the fume hood opening is 18 inches.Puff smoke around the opening of the hood by using the Ventilation Smoke Tubes. Divide the fume hood opening into nine squares.Turn the Alnor thermoanemometer to the Temperature position to check the battery.

What do you do if a laboratory fire erupts?

Flammable materials, like alcohol, should never be dispensed or used near an open flame. If a laboratory fire erupts, immediately notify your instructor.

When you work in the laboratory long hair must be?

4. Loose hair and clothing must be restrained. Long hair and loose clothing that can get caught on glassware or otherwise be a hazard in lab should be pulled back.

What footwear is best in the laboratory?

ACCEPTABLE footwear that provides protection and is commonly worn in the laboratory work includes fabric-covered shoes (e.g., athletic shoes, sneakers) and perforated leather shoes.

When diluting acids you should never?

Do not mix acids and bases unless you are instructed to do so. The reaction of the two together can release a lot of heat and cause damage. Always dilute acids or bases by adding them to water. If you add water to a concentrated acid the heat released can cause an explosion, spreading acid throughout a room.

Do you pour water into acid?

So much heat is released that the solution may boil very violently, splashing concentrated acid out of the container! If you add acid to water, the solution that forms is very dilute and the small amount of heat released is not enough to vaporize and spatter it. So Always Add Acid to water, and never the reverse.

How do you dilute a strong acid?

Key ConceptsIn an aqueous solution of a strong acid: ⚛ acid is the solute. ⚛ water is the solvent.An aqueous solution of strong acid can be diluted by adding more water to the solution.When an aqueous solution of strong acid is diluted: ⚛ Concentration of H+(aq) decreases. ⚛ pH increases.