Silver ion has an average concentration of 28 ppb (parts per billion) in U.S. water supplies.
(a) What is the molality of the silver ion?
(b) If you wanted 1.0 × 10² g of silver and could recover it chemically from water supplies, what volume of water in liters would you have to treat? (Assume the density of water is 1.0 g/cm³.)