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Physical Chemistry

Blazing goIITian

Joined:	1 Jan 2008
Post:	794

18 Apr 2008 15:56:15 IST

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592

some concepts to be cleared of v.p .....

None

wht is the effect on vapour pressure of d followng:

1) conc. is increased

2) temp is increased

3) volatile solute is added

4) if electric current is passed thro d vessel

5) pressure is increased

6) vessel is taken to the centre of earth

7) soln is stirred vigourously

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Comments (10)

ashish banga

Blazing goIITian

Joined: 16 Dec 2006

Posts: 1362

18 Apr 2008 16:18:58 IST

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concentration of what

temperature increases vapour pressure

Sagar Vaze

Blazing goIITian

Joined: 11 Apr 2008

Posts: 315

18 Apr 2008 16:24:20 IST

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pressure increased vp reduced (principle of pressure cooker)

pinnacle

Hot goIITian

Joined: 16 Aug 2007

Posts: 176

18 Apr 2008 16:28:58 IST

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wht is the effect on vapour pressure of d followng:
1) conc. is increased- VP Increases
2) temp is increased- Increases
3) volatile solute is added- Decreases
4) if electric current is passed thro d vessel- Increases[nt sure]
5) pressure is increased-Decrease
6) vessel is taken to the centre of earth- NO IDEA
7) soln is stirred vigourously- NO IDEA

Sagar Vaze

Blazing goIITian

Joined: 11 Apr 2008

Posts: 315

18 Apr 2008 16:29:50 IST

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dont know if this is correct
6) vp increases because since gravity acting is zero, pressure gradient due to gravity is absent so overall pressure reduced so vp increase

chemicaltester

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18 Apr 2008 23:56:20 IST

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solution pressure i.e vapor pressure has no relation with gravity( u can neglect the effect of gravity on gas molecule)
also when current is passed the no of ions increases and hence vapor pressure increases

when solution is stirred vigorously k.e of molecules increases as a result the tendency to go in vapor is satisfied easily so vapor pressure increases .also by stirring the surface area increases so much more surface area is available for molecule to go in vapor form

Sagar Vaze

Blazing goIITian

Joined: 11 Apr 2008

Posts: 315

19 Apr 2008 20:41:43 IST

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@chemicaltester
i don't get gravity part of your answer. According to pascals law p(h)=hdg+p(atm) so in absence of gravity p(h) will be lesser at every coresponding point so vp should increase.
Please clarify

TheTwinz

New kid on the Block

Joined: 19 Apr 2008

Posts: 4

20 Apr 2008 00:35:32 IST

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if soln is stirred vigorosly, the temperature rises as work is being done.thus vp should increase

srk

Blazing goIITian

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Posts: 794

20 Apr 2008 11:50:53 IST

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nice work guys.
i have one more doubt:
wht is the effect of following on pH of an acid:
1) temperature
2) concentration
3) pressure
4) addition of a buffer

Abhishek roy

Blazing goIITian

Joined: 19 Jan 2008

Posts: 351

20 Apr 2008 13:17:25 IST

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OK TRY .........

1) TEMPERATURE INCREASE RESULTS IN INCREASE OF IONIZATION HENCE CONCENTRATION OF H+ IONS SO PH SHUD DECREASE .

2) INCREASE IN CONCENTRATION GENERALLY DECREASES PH

3) I FEEL INCREASING PRESSURE MUST INCREASE PH AS IONIZATION WILL CEASE . IMNOT SURE IT MAY ALSO HAV NO EFFECT

4) PH SHUD INCREASE COZ BUFFER IS A SOLN. RIGHT SO INCREASES VOLUME OF WATER AND ALSO WILL TRY TO BRING SOLN. TO PH OF BUFFER ITSELF .

I MAY BE WRONG , CMON IM JUST PASSED 11TH

srk

Blazing goIITian

Joined: 1 Jan 2008

Posts: 794

23 Apr 2008 00:32:38 IST

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i agree with u
but i dont knw the answers.

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