Question

Please help with how to approach this kind of question.
Which 0.10M solution has the highest osmotic pressure?

a) HCl
b)CaCl2
c) LiCl
e) all have the same

how do you approach a question like this? What would you need to know to get the answer?

Answer 1

SO osmotic pressure is a colligative property, which means it depends on the number of particles in solution. So NaCl has 2 particles for every mole of NaCl. NaCl--> Na+ + Cl-
But Ethanol has only one particle, not ionic. So look at the list, write down which of them dissociates further, and how many particles it will result in. Then knowing that higher the number of particles, the higher the osmotic pressure, you will be able to choose the right answer. More reading at: http://en.wikipedia.org/wiki/Colligative_properties

Answer 2

Depression of Boiling Point and elevation of freezing point are two other colligative properties and behave in the same way.

Answer 3

Would the answer be B) CaCl2? @Preetha

Answer 4

Yes. How many particles released per mole?

Answer 5

@Preetha 3 particles