18 Solubility - What is the concentration of Pb2+ in a...

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1 What is the concentration of Pb 2+ in a saturated solution of PbBr 2 (K sp = 6.3 x 10 -6 )? Relevance: Can lead be removed from drinking water by precipitation as lead bromide to meet EPA standards? A) 1.2 x 10 -2 M B) 2.5 x 10 -3 M C) 1.8 x 10 -3 M D) 1.5 x 10 -2 M E) 1.8 x 10 -2 M 2 What is the concentration (mol/L) of Pb 2+ in a saturated solution of PbBr 2 (K sp = 6.3 x 10 -6 )? 2 2 2 2 2 3 6 2 ( ) ( ) 2 ( ) 0 0 2 : / 2 / [ ][ ] ( )(2 ) 4 6.3x10 1.2x10 PbBr s Pb aq Br aq lots x x x at eq x mol L x mol L Ksp Pb Br x x x x M
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3 Water in D.C. Exceeds EPA Lead Limit Random Tests Last Summer Found High Levels in 4,000 Homes Throughout City By David Nakamura Washington Post Staff Writer Saturday, January 31, 2004; Page A01 Tap water in thousands of District houses has recently tested above the federal limit for lead contamination , a new phenomenon that has baffled the D.C. Water and Sewer Authority and forced the agency to begin replacing pipes. Four-year-old Michael Joseph often visits at the Georgetown home of his grandfather Charles Eason, whose tap water registered 36 times the EPA limit in the random testing. ( Michael Robinson-Chavez - The Washington Post) 4 What is the EPA limit on lead in drinking water?
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18 Solubility - What is the concentration of Pb2+ in a...

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