A solution is prepared that contains 10 mM NaCl, 20 mM CaCl2, 20 mM BaCl2, and 50 mM NiNO3. Of course, all these salts completely dissolve to their respective cations and anions. The pH is 7.0.
(a) Calculate the ionic strength of the solution.
(b) Calculate the activity coefficients for H+, Cl-, and Ba2+ (use the Guntenberg approximation because the solutions do, though note there are a few other equations and a graph that can be used at your discretion any other time).
(c) Compare the concentrations and the activities of these three species—what is the percent difference between the concentration and the activity for H+, for Cl-, and for Ba2+?
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A sample of a substance with the empirical formula XCl2 weighs 0.5555 g. When it is dissolved in water and all its chlorine is converted to insoluble AgCl by addition of an excess of silver nitrate, the mass of the resulting AgCl is found to be 1.1681 g. The chemical reaction is XCl2 + 2 AgNO32AgCl + X(NO3)2
(a) Calculate the formula mass of
XCl2.
(b) Calculate the atomic mass of X.
In: Chemistry
4-A. Can a fuel cell be both an electrollzer producing hydrogen and a power source producing electricity and heat?
B. Storage batteries have great potential for storing off-peak power as well as accommodating ‘green energy’ However they have serious problems limiting their use. What are they?
In: Chemistry
1
a) An electric range burner weighing 698.0
grams is turned off after reaching a temperature of
463.5°C, and is allowed to cool down to
22.0°C.
Calculate the specific heat of the burner if all the heat evolved
from the burner is used to heat 593.0 grams of
water from 22.0°C to
81.4°C.
b)An electric range burner weighing 698.0 grams
is turned off after reaching a temperature of
478.0°C, and is allowed to cool down to
23.8°C.
Calculate the specific heat of the burner if all the heat evolved
from the burner is used to heat 567.0 grams of
water from 23.8°C to 80.4°C.
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A 9.15 g sample of an aqueous solution of hydroiodic acid contains an unknown amount of the acid. If 29.3 mL of 0.506 M sodium hydroxide are required to neutralize the hydroiodic acid, what is the percent by mass of hydroiodic acid in the mixture?
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The solubility product constant for barium sulfate is 1.1 x 10^-10 Will a precipitate of BaSO4 form when 210 mL of 4.75 x 10^-2 M
Ba (NO3)2 is mixed with 315 mL of .450 M Li2SO4
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The following information is given for magnesium at 1atm: boiling point = 1.090E3
In: Chemistry
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Calculate the concentrations of all five chemical species present in a 0.750 M solution of hypoiodous acid.
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What mass of NaCO3 is required to remove 90% of these ions
from10.0L of laundry water?
Since soap and detergent action is hindered by hard water,
laundryformulations usually include water
softeners-calledbuilders-designed to remove hard water ions
(especially Ca2+ andMg2+) from the water. A common builder used in
North America issodium carbonate. Suppose that the hard water used
to do laundrycontains 75 ppm CaCO3 and 55 ppm MgCO3 (by mass).
In: Chemistry
Consider the equilibrium shown.
PbBr2(s)−⇀↽− Pb2+(aq)+2Br−(aq)Ksp=2.10×10−6
Determine the concentrations of Pb2+ and Br− in a saturated solution of PbBr2 in pure water (assume μ=0 M).
[Pb2+]=
M
[Br−]=
M
Determine the concentrations of Pb2+ and Br− in a saturated solution of PbBr2 in a solution with an ionic strength of 0.010 M.
[Pb2+]=
M
[Br−]=
M
Determine the concentrations of Pb2+ and Br− in a saturated solution of PbBr2 in a solution with an ionic strength of 0.10 M.
[Pb2+]=
M
[Br−]=
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Does gelatin contain tyrosine? How do you know?
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What is the molality of a solution of naphthalene in benzene if the freezing point of pure benzene is 5.5°C and the freezing point of the solution is 4.0°C. The freezing point depression constant for benzene is 5.12°C m-1.
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Which compound has the smallest molecular weight? A. Al(OCH3)3 B. Ga(OCH3)3
C. B(OCH3)3 D. (BO(OCH3))2
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