Estimate the average concentration of methylene chloride

Reference no: EM13131603

Laboratory ventilation
1. Think and describe what you would do in each of the following situations which could happen in your laboratory.
a. You are working at your station and the 100-mL round-bottom flask in which you are running a reaction in ether solvent suddenly catches fire.
b. The person working across the laboratory bench from you allows hydrogen chloride gas to escape from his or her apparatus.
c. A reagent bottle is dropped, spilling concentrated sulfuric acid
d. A hot solution 'bumps" splashing your face.

2. A laboratory has four hoods each of which is 39 in. wide. When the hood door is open to a height of 8 in. and the hoods are operating, the average
air velocity through the hood face is 170 ft/min.

a. Evaluate the total ventilation rate for this room assuming that there are no other exhausts.
b. The laboratory is designed for use by 30 students. Evaluate the air available per student if the mixing factor is 0.3, and experiments last for 3 hours.
c. An experiment is _considered in which each student would be required to evaporate 7 mL of methylene chloride (CH2CI2).

Estimate the average concentration of methylene chloride. Look up the TL V or the 1WA for methylene chloride and consider how the:
evaporation might be performed.

3. A laboratory has a ventilation system that provides 20 cubic meters for each student during laboratory period. (This figure includes the mixing factor.) An experiment is considered for this program that uses the following quantities of materials A, B, and C. The TLV is also listed for each compound.
§substance Quantity (ma) TL V (mg/cubic meter)

A 400 1200
B 500 200
C 200 5

Assess the relative risks of these three compounds. Is there a likely need for operations to be conducted in a hood if the compounds are assumed to be
entirely evaporated?

Reference no: EM13131603

Questions Cloud

Calculate the pressure of the gas inside the cylinder : a cylinder measuring 3.4 cm wide and 4.0 cm high is filled with gas. The piston is pushed down with a steady force measured to be 275 kpa

Find probability to visit both you and your neighbor bill : The traveling salesperson randomly selects 5 apartments in your building to visit. What is the probability that she visits both you and your neighbor bill?

Prepare the journal entries for the issuance of the bonds : XYZ Company is building a new hockey rink at a cost of $1,500,000. It received a down payment of $500,000 from local businesses in support of the project and now needs to borrow $1,000,000 to complete the project. It therefore decides to issue $1,..

What is the actual total direct labor cost : Production for the current period was assigned a $200,000 standard direct labor cost. What is the actual total direct labor cost for the current period?

Estimate the average concentration of methylene chloride : Estimate the average concentration of methylene chloride. Look up the TL V or the 1WA for methylene chloride and consider how the: evaporation might be performed.

What is the reducing agent in the redox reaction : The amount of H2O2 in 15.8g of hair bleach was determined by titration with a standard potassium permagnate soln. MnO4-(aq)+H2O2(aq)--Mn2+(aq)+O2

Find probability that a student will complete the exam : What is the probability that a student will complete the exam in more than 60 minutes but less than 75 minutes?

End of the fiscal period : Suppose that nominal accounts are not closed out at the end of the fiscal period. Explain how this affects account data for the next fiscal period. Use a company or industry to help explain your answer.

Illustrate what amounts should be considered product : Eighty percent of the premium applies to manufacturing operations and 20% applies to selling and administrative activities. Illustrate what amounts should be considered product and period costs respectively for the first year of coverage?

User Account

All Pages