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just a simple check of your ability

Cool goIITian

Posted on
26 Oct 2011 22:30:54 IST
Posts: 30
26 Oct 2011 22:30:54 IST
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just a simple check of your ability
Engineering Entrance , JEE Main , JEE Main & Advanced , Chemistry , Physical Chemistry , Inorganic Chemistry

In chemistry we study dil.solution.

in this chapter when we study osmotic pressure we use this formula (pie*V=nRT) but this is only the gas equation  PV=nRT

just pie in place of V.

so, i want you to answer that it is the formula of gas and we are using it in solution .Why

Keep Thinking

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New kid on the Block

Joined: 27 Oct 2011 11:04:24 IST
Posts: 1
27 Oct 2011 11:08:54 IST
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pie in the above formula is the osmotic pressure exerted by the particles of solute whereas the p in ideal gas eqnt symbolises the eq.pressure exerted by the particles of gas

Cool goIITian

Joined: 24 Sep 2011 01:08:21 IST
Posts: 30
27 Oct 2011 14:16:07 IST
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dude this is what I am asking,we are just changing the simple constant p with pie and saying this is the osmotic pressure.you didnot understand the quetion sorry

New kid on the Block

Joined: 28 Aug 2011 23:52:50 IST
Posts: 28
27 Oct 2011 20:33:53 IST
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its abut pressure in solution which is pie and the pressure in atmosphere is 1 bar so here we use pie its simple as that ...

Cool goIITian

Joined: 24 Sep 2011 01:08:21 IST
Posts: 30
28 Oct 2011 00:32:25 IST
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dude you also took me wrong.my quetion is that can you explain why we are using this formula.?because if you see this formula and compare it with gas equation it is all same as n denote number of moles,v =volume,and r and t also are same as that of gas equation then why are we using gas equation in dilute solution.this is my question and you are all taking it wrong

New kid on the Block

Joined: 28 Oct 2011 17:56:38 IST
Posts: 1
28 Oct 2011 17:56:59 IST
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osmotic pressure for liquids is nothing different from diffusion pressure for gases except that osmotic pressure is a term used for movement of solvent molecules. So, the basic concept remains the same. We use pie because, here we talk about the concentration of solution that is in molarity. so we write pie=crt. but obviously, we dont have molarity for gases... I think u have got your answer now..

Cool goIITian

Joined: 24 Sep 2011 01:08:21 IST
Posts: 30
30 Oct 2011 22:34:57 IST
3 people liked this

ok now all done,the correct answer is this that we only talk about dilute liquids as theory given by vant hoff that when liquids are dilute they behave as gases and so we are using this formula here.note if liquids are concentrated we cannot use this formula to measure pressure of gases except in special conditions.hope you all get me

Cool goIITian

Joined: 24 Sep 2011 01:08:21 IST
Posts: 30
1 Nov 2011 12:33:25 IST
0 people liked this

plz rate if you like it

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