Drinking water may contain a low concentration of lead ion, Pb2+, due to corrosion of old lead pipes. The EPA has determined that the maximum safe level of lead ion in water is 15 ppb. Suppose a sample of tap water was determined to have a lead ion concentration of 0.0090 ppm. Assume the density of the solution is 1.00 g/mL.
(a) What is the concentration of lead ion in the tap water in units of ppb? Is it safe to drink?
(b) What is the concentration of lead ion in units of mg/mL?
(c) What mass of lead ion is in 100.0 mL of this drinking water?
(d) How many moles of lead ion are in 100.0 mL of the water?
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