11.41 The solubility of KCl at 20°C is 34.0 g per 100 g of water. What is the maximum amount (in grams) of KCl
that will dissolve in 50.0 g of water at 20°C?
11.42 The solubility of ammonium chloride at 30°C is 41.1 g per 100 g of water. What is the maximum amount (in
grams) of ammonium chloride that will dissolve in 455.0 g of water at this temperature?
11.49 What is the percent-by-mass concentration of NaCl in a solution that is prepared by adding 15.0 g of NaCl to
90.0 g of water?
11.50 What is the percent-by-mass concentration of sucrose in a solution that is prepared by adding 25.0 g of
sucrose to 100.0 g of water?
11.51 What mass of KI is dissolved in 700.0 g of a solution that is 15.0% KI by mass?
11.59 The chemical trichloroethylene (TCE) is a colorless liquid found in very low concentration in drinking water.
The EPA has set a maximum concentration of TCE in drinking water at 5 ppb. Consuming water on a regular basis
that contains higher concentrations can lead to cancer.
(a) What is the ppb concentration in a 200.0-L (200.0 kg) sample of water that contains 0.43 mg TCE?
(b)
Is this water safe to drink?
11.60 Polychlorinated biphenyls (PCBs) are absorbed by our bodies from some of the foods we eat. If a 65-kg
male is determined to have a PCB level of 190 ppb, what is the mass (in grams) of PCBs in his body?
11.61 How many moles of HCl are contained in 100.0 mL of 0.15 M HCl?
11.62 What volume of 0.25 M NaOH contains 0.050 mol NaOH?
11.71
One way to remove lead ion from water is to add a source of iodide ion so that lead
iodide will precipitate out of solution:
Pb2+(aq) + 2I−(aq) PbI2(s)
(a) What volume of a 1.0 M KI solution must be added to 100.0 mL of a solution that is 0.15 M in
Pb2+ ion to precipitate all the lead ion?
(b)
What mass of PbI2 should precipitate?
11.72
If a solution of AgNO3 is added to an HCl solution, insoluble AgCl will precipitate:
AgNO3(aq) + HCl(aq) 
AgCl(s) + HNO3(aq)
(a) What volume of a 1.20 M AgNO3 solution must be added to 250.0 mL of a 0.100 M HCl
solution to precipitate all the chloride ion?
(b)
What mass of AgCl should precipitate?
11.75
What volume of 0.1050 M NaOH is required to neutralize 20.00 mL of 0.1500 M H2SO4?
(Begin by writing a balanced chemical equation for the reaction.)
11.78
When 20.00 mL of 1.005 M H2SO4 is titrated with a solution of NaOH, 44.68 mL of NaOH
is required to neutralize the H2SO4. What is the molarity of the NaOH solution?
11.79
What volume of 0.1000 M NaOH is required to neutralize each of the following
solutions?
(a) 10.00 mL of 0.1000 M HCl
(b) 15.00 mL of 0.3500 M HNO3
(c) 25.00 mL of 0.0500 M H3PO4