Question

QUESTION 3 

Place the following solutions in order of increasing osmotic pressure. (Hint: the solutes are l. molecule, II. a soluble ionic and III. a weak acid). 

I.0.15 M C₂H₆O₂ II. 0.15 M NaCI III. 0.15 M HF

QUESTION 4 

Place the following aqueous solutions of nonvolatile, nonionic compounds in order of decreasing osmotic pressure. 

I. 0.011 M sucrose II. 0.0095 M glucose III. 0.0060 M glycerin 

Answer 1

Question-3 :

since NaCl is soluble as well as ionic in nature so it fully dissociate to give Na+ and Cl- ion so concentration gets high also osmotic pressure .

while HF is weak acid so it will less dissociate so it's osmotic pressure is less than NaCl.

while glycol is non dissociating so it's osmotic pressure is too low .

so order is

I < III < II

Question : 4

among all of them all are non volatile non dissociating compounds so it's concentration matters only which gets high has high pressure as

π = cRT where π $\alpha$ c

so , order is

I > II > III