The freezing point of 0.109 m aqueous formic acid is −0.210°C. Formic acid, HCHO 2 , is partially dissociated according to the equation HCHO 2 ( a q ) ⇌ H + ( a q ) + CHO 2 − ( a q ) Calculate the percentage of HCHO 2 molecules that are dissociated, assuming the equation for the freezing-point depression holds for the total concentration of molecules and ions in the solution.
The freezing point of 0.109 m aqueous formic acid is −0.210°C. Formic acid, HCHO 2 , is partially dissociated according to the equation HCHO 2 ( a q ) ⇌ H + ( a q ) + CHO 2 − ( a q ) Calculate the percentage of HCHO 2 molecules that are dissociated, assuming the equation for the freezing-point depression holds for the total concentration of molecules and ions in the solution.
Solution Summary: The author explains that molality of aqueous formic acid that undergoes partial dissociation is 0.0830m.
Author: Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell
The freezing point of 0.109 m aqueous formic acid is −0.210°C. Formic acid, HCHO2, is partially dissociated according to the equation
HCHO
2
(
a
q
)
⇌
H
+
(
a
q
)
+
CHO
2
−
(
a
q
)
Calculate the percentage of HCHO2 molecules that are dissociated, assuming the equation for the freezing-point depression holds for the total concentration of molecules and ions in the solution.
The autoionization constant of ethanol at 25 degrees celsius is Kai=1.6X10^-19. What does this tell you about the autoionization of ethanol relative to that of water?
What is the freezing point of a 0.15 m organic compound solution in benzene?
Assume that when you were transferring the mass of sodium chloride you measured to Test Tube 2, a smalle amount remained on the weighing paper, so that actual mass of NaCl you added to the tube was a bit smaller that the mass you thought you trasnferred. Describe how this error would affect each of the following values.
a. The freezing poing depression that you measured.
b. The motality that you calculated from your measurement of the freezing point depression.
c. The molar mass of NaCl that you calculated from the molairty that you determined.
Chapter 12 Solutions
General Chemistry - Standalone book (MindTap Course List)
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Author:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell
Author:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell