Question 12 of 15 Map A Sapling Learning According to the EPA, the maximum conta

Question

Question 12 of 15 Map A Sapling Learning According to the EPA, the maximum contaminant level (MCL) of thallium in drinking water is 0.0020 mg/L. (a) Convert the MCL of thallium from milligrams perliter to parts per Number billion (ppb) ppb (b) A farmer has recently dug a new well for his property. He sends Number a 12.0 mL sample of the well water to the EPA to be tested for the presence of thallium. What is the maximum amount of TI (in Aug) Hg that can be present in this 12.0 L sample based on its MCL? m (c) Suppose the farmer has rethought his plan and dug a new well on the other side of his property. He sends a new 12.0 mL sample. O yes After testing, the EPA determines that the sample of water contains O no Ag/mL TI. Is the well water safe to O not enough information Hint O Previous ® Give Up & View Solution Check Answer Next Ext

Explanation / Answer

GIven MCL of drinking water is 0.002 mg/L

1 mg/L = 1 ppm

0.002 mg/L = 0.002 ppm

1 ppm = 1000 ppb

0.002 ppm = 2 ppb (ug/L)

From the above results

2 ug can present in 1 litre

1000 m l = 2ug

12 ml ===> 2*12 / 1000 = 0.024 ug

Upto 0.024 ug of Tl can present in the water

After testing

0.0008 ug < 0.024 ug

So ....water is safe to consume

ANswer is YES

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