Question

Determine the molar concentration of an aqueous solution of lead(II) nitrate solution that is 26 ppb (parts per billion) Pb(NO₃)₂. Since the solution is very dilute, assume the density is that of water, 1.00 g/mL.

A)	7.85 ´ 10–14M	D)	7.85 ´ 10–8M
B)	2.60 ´ 10–8M	E)	7.85 ´ 10–11M
C)	4.26 ´ 10–11M

The National Primary Drinking Water Regulations limit the concentration of lead in drinking water to 0.015 mg/L, which is __________.

A)	0.015 ppb	D)	15 ppb
B)	15 ppm	E)	150 ppb
C)	1.5 ppb

Answer 1

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