The Henry\'s constant for dichloromethane (DCM) is approximately 0.50 mol/(L atm

Question

The Henry's constant for dichloromethane (DCM) is approximately 0.50 mol/(L atm) at 20degreeC. What is the dimensionless Henry's constant? If the atmospheric concentration of DCM is measured to be 1.0 mu/m^3 what is the concentration of DCM (in /rg/L) in rainwater at equilibrium? At 25 degree C. the Henry's constant for carbon tetrachloride (CCI,) is 1.1. Assume an indoor pool in a poorly ventilated building has been filled with water contaminated with CC1_4. If after reaching equilibrium with air at 25 degree C, the pool water concentration of CCI_4 is 5.0 ppm, what will the gaseous concentration of CCI_4 in the air be? Will it be in violation of the OSHA air standard which specifies a maximum of 10 ppm,? Show all work to defend your answer.

Explanation / Answer

a.) Dimensionless Henry's Constant = Henry's Constant * RT

where, R --> gas constant

T --> Temperature in K

Dimensionless Henry's Constant = 0.5 mol/ L.atm * 8.314 J/ mol.K * 293 K

= 1.21 x 103

Cair = H * Cwater

Cwater = Cair / H

Cwater = 1 / 0.5 = 2 µg/L

b.) Similarly as (a), we can calculate the value of Cair

Cair = H * Cwater

Cair = 1.1 * 5 ppm

= 5.5 ppm

No it will not be a violation of OSHA standard because the concentration of CCl4 in air aor gaseous concentration of CCl4 is less than 10 ppm.

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