Yes, it is safe to drink. No, it is not safe to drink. Be sure to answer all par

Question

Yes, it is safe to drink.

No, it is not safe to drink.

Be sure to answer all parts.

The chemical trichloroethylene (TCE) is a colorless liquid found in very low concentration in drinking water. The EPA has set a maximum concentration of TCE in drinking water at 5 ppb. Consuming water on a regular basis that contains higher concentrations can lead to cancer.

(a) What is the ppb concentration in a 200.0L (200.0 kg) sample of water that contains 0.37 mg TCE?



(b) Is this water safe to drink?   

Yes, it is safe to drink.

  

No, it is not safe to drink.

Explanation / Answer

0.37mg / 200L = 0.185mg/ 100 kg

                        = 0.185/100 ppm ( because 1mg/kg =1ppm)

                         = 1.85 X 10-3 ppm

                         = 1.85 ppb

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