We’re being asked to determine the solution with the highest osmotic pressure.
The osmotic pressure (Π) of a solution is related to the molarity of the solution:
i = van’t Hoff factor
M = molarity of the solution (in M or mol/L)
R = gas constant (0.08206 atm • L/mol • K)
T = temperature
We will do the following steps to solve the problem:
Step 1: Determine van't Hoff factor
Step 2: Convert torr to atm
Step 3: Calculate the molarity using osmotic pressure
Step 4: Calculate the moles of solute
Step 5: Calculate the molar mass of the salt
Step 6: Determine n using the molar mass of the salt
A lithium salt used in lubricating grease has the formula LiCn H2n + 1 O2. The salt is soluble in water to the extent of 0.036 g per 100 g of water at 25 oC. The osmotic pressure of this solution is found to be 57.1 torr.
Assuming that molality and molarity in such a dilute solution are the same and that the lithium salt is completely dissociated in the solution, determine an appropriate value of n in the formula for the salt.
Frequently Asked Questions
What scientific concept do you need to know in order to solve this problem?
Our tutors have indicated that to solve this problem you will need to apply the The Colligative Properties concept. You can view video lessons to learn The Colligative Properties. Or if you need more The Colligative Properties practice, you can also practice The Colligative Properties practice problems.
What professor is this problem relevant for?
Based on our data, we think this problem is relevant for Professor Gorman's class at LONESTAR.