The EPA Has Determined That the Maximum Safe Level of Lead

question 65

Multiple Choice

The EPA has determined that the maximum safe level of lead ion in drinking water is 15 ppb.If a sample of tap water has a lead ion concentration of 0.0065 ppm, what is the concentration of the lead ion in ppb, and is the water safe to drink? Assume the density of the solution is 1.00 g/mL.

• A)65 ppb, not safe
• B)6.5 ppb, safe
• C)650 ppb, not safe
• D)0.65 ppb, safe
• E)6.5 * 10^-6 ppm, safe

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Regulations set by central banks determining the minimum amount of reserves that banks must hold against deposits, used to control the money supply.

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