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Physical Chemistry

Blazing goIITian

Joined:	3 Apr 2007
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5 Mar 2008 20:26:41 IST

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371

todays chem Maharashtra board que....

None

the boiling point will be max for
1)urea
2)sucrose
3)sodium chloride
4)sodium sulphate
i ve written the ans as sodium sulphate as van't hoff fACTOR will be max for it ..
but my frendz say it is sodium chloride as its mol wt is least and BP is inversely proportional to MOL wt
plzzz tell wat is correct...
rates assured

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Comments (12)

mohit patni

Blazing goIITian

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5 Mar 2008 20:32:33 IST

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plzzzz some one!!!

kundan a.k.a Juan Dankh

Blazing goIITian

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5 Mar 2008 20:38:05 IST

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noo...yaar ......sorry to break this to you par ur wrong.......

the answer would be sodium chloride...the reason being ki..

there are strong electrostatic attractions between the positive and negative ions, and it takes heck a lot of heat energy to overcome them. ...

what ur friends said as reason isn't the most convincing one.........might be taken as a peripheral

ashwin menon

Scorching goIITian

Joined: 29 Jun 2007

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5 Mar 2008 20:39:49 IST

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well..i think..if they did giv the same CONCENTRATIOn..then the mol weight doesnt come into play... so ig uess sodium sulphate wud be rite..but in other cases...it mmay go wrong

mohit patni

Blazing goIITian

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5 Mar 2008 20:40:42 IST

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kundan plzz tell the explanation and wats wrong in my logic???

mohit patni

Blazing goIITian

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5 Mar 2008 20:41:10 IST

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ashwin ive typed the que as it was given

kundan a.k.a Juan Dankh

Blazing goIITian

Joined: 22 Dec 2007

Posts: 550

5 Mar 2008 20:45:06 IST

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@ aspirant.........
i've just checked the precise value for you......

boiling point of :

sod. chloride - 1465degree celsius......

sod. sulphate - 1429 degree celsius.......

mohit patni

Blazing goIITian

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5 Mar 2008 20:49:16 IST

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thanks but its more imp for me to know the reason behind this....
its not abt getting it right or wrong but getting the concept plzzz reply....

mohit patni

Blazing goIITian

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Posts: 593

5 Mar 2008 20:57:20 IST

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kundan plzzzz!!!!
or anyone else plzzz!!!!

mohit patni

Blazing goIITian

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5 Mar 2008 21:05:27 IST

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by the way kundan ive rated u for ur efforts...

BUT more ans needed plzzzzzzzzzzzz!!!!!!

kundan a.k.a Juan Dankh

Blazing goIITian

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5 Mar 2008 21:08:48 IST

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yaar see my first post ..............i've given the reason in it............

Akhil

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6 Mar 2008 15:27:25 IST

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hey i wrote Na2 SO4 ...knowin our MH boarrd i shd be right!

Akhil

Blazing goIITian

Joined: 17 Jan 2008

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6 Mar 2008 16:11:59 IST

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and molecular weight won't matter here coz solutions are EQUIMOLAR and so also EQUIMOLAL ...
so van't Hoff factor =3 for Na2SO4 and 2 for NaCl...
this is theoretically right....experimentally it could very well be wrong..but with no given values i think sulfate shd be right

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