Chemistry
posted by Michelle
1. If an aqueous solution that is 0.15 M in HF has an osmotic pressure of 3.9 atm at 25oC, what is the percent ionization of HF at this concentration?
2. A mixture of 2 volatile liquids is said to be ideal if each component obeys Raoult’s Law:
Pi=XiPio
Two volatile liquids A (molar mass 100 g/mol) and B (molar mass 110 g/mol) form an ideal solution. At 55oC, A has a vapor pressure of 98 mm Hg and B has a vapor pressure of 42 mmHg. A solution is prepared by mixing equal masses of A and B.
Calculate the mole fraction of each component in the solution.

DrBob222
pi = iMRT
Solve for i (use 0.08206 for R).
Then effective M = i*0.15 = ?
Then HF ==> H^+ + F^
(H^+)=(F^) = x
(HF = 0.15x
Then x+x+0.15x = i*0.15
Solve for x = (H^+) and
%ion = (H^+)/0.15)*100 = 
DrBob222
What's the problem with #2? Just take equal amount of A and B (it doesn't mattr how many g you take as long as the amounts are equal). Calculate X of each and from there solve for p of each. I can help you if you get stuck.
Respond to this Question
Similar Questions

Chemistry Help!!!
How will the osmotic preassure of an aqueous solution change as evaporation occurs? 
Chemistry
hellppp please i have a test on this on mondayy im so screwed A solid mixture contains MgCl2 and NaCl. When 0.5000 g of this solid is dissolved in enough water to form 1.000 L of solution, the osmotic pressure at 25°C is observed … 
CHM 152
The freezing point of an aqueous solution of glucose was measured to be 1.52 oC. What is the osmotic pressure, in atm, of 100 mL of this solution at 25.0 oC? 
chemistry
A sample containing 0.0500mol of Fe2(SO4)3 is dissolved in enough water to make 1.00L of solution. This solution contains hydrated SO4 2 and Fe(H2O)6 3+ ions. The latter behaves as an acid: Fe(H2O)6 3+ > Fe(H2O)5OH 2+ + H+ a) … 
Chemistry
Determine the partial pressure of oxygen necessary to form an aqueous solution that is 7.7 x 104 M O2 at 25oC. The Henry's Law Constant for oxygen in water at 25oC is 1.3 x 103 M/atm 
Chemistry
A solution is made by dissolving 0.500 mol of HF in enough water to make 1.00 L of solution. At 21 C, the osmotic pressure of the solution is 1.35 atm. What is the percent ionization of this acid? 
chemistryyyy
A solution is made by dissolving 0.0100 mol of HF in enough water to make 1.00 L of solution. At 23 °C, the osmotic pressure of the solution is 0.308 atm. What is the percent ionization of this acid? 
Chemistry
An aqueous solution containing 10.50 g of a compound in 100.0 ml of solution has an osmotic pressure of 0.0187 atm. at 25°C. What is the molecular weight of the compound? 
Gen Chem
A mixture of NaCl and sucrose (C12H22O11) of combined mass 10.2 g is dissolved in enough water to make up a 250 mL solution. The osmotic pressure of the solution is 8.29 atm at 23°C. Calculate the mass percent of NaCl in the mixture. 
Chemistry
An aqueous solution is composed of 7.50 g NaCl (MM = 58.44 g/mol) diluted to 0.100 L. Calculate the osmotic pressure of the solution at 298 K a. 5.83 atm b. 9.22 atm c. 18.3 atm d. 62.8 atm