Chemistry Henry's law applied to a solution of a solute in a solvent

AI Thread Summary
The discussion centers on the application of Henry's law to solutions, with participants debating the correctness of various options regarding the law's principles. Option B is deemed incorrect because it misrepresents the relationship between Henry's constant and pressure in an ideal solution. Options A and C are supported as correct, while D is dismissed as nonsensical, and E is argued to be valid under specific conditions. The conversation highlights the complexity of interpreting Henry's law and its relationship with Raoult's law in different solution scenarios. Overall, the participants seek clarity on the correct application of these laws in chemistry.
havenly
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Homework Statement
Let a solution of a solute B in a solvent A the vapour pressure is represented on the cluster below

A.The region in circle 1 accounts for the behavior of the solute in an ideally diluted solution
B.The vapour pressure of B is equal to Henry's constant in the case of an ideal solution?
C.Henry's constant is dimensional
D.Vapour pressure PB* corresponds to atmospheric pressure
E.The region in circle 2 accounts for the behaviour of the solvent in an ideally diluted solution.

I think it's B That's right?
Relevant Equations
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1.jpg
 
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I do not agree. Explain why you think so ...

Also: please explain why you think A, C, D, E are not correct...

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i think
option b is incorrect because k= pB* i.e. the pressure of the pure body in an ideal solution
C. henry's constant has the dimensions of a pressure
D.la steam pressure of pB* corresponds to the pression of the pure body.
E. a solution ideally diluted follows Henry's law and in circle 2 we see raoult's law.
the correct answer is a?
 
havenly said:
option b is incorrect because k= pB* i.e. the pressure of the pure body in an ideal solution
I find your picture difficult to read, but it seems to me the top right symbol is ##K_B## and the straight line says 'Ideal dilute solution (Henry's law)'.

In region 1 the ##p(x_B)## follows the straight line closely, so there you have ##p = K_B \,x_B##.
(so not k= pB* !)
In this case the constant ##K_B## has the dimension of pressure / mole fraction, i.e. it is not dimensionless.
(so doesn't that mean that answer C is correct too ? Unfortunately there are several forms of Henry's law -- also check here)

I can only assume that the ordinate is the partial pressure of B, although the axis title is 'Pressure'.

In summary: A seems correct, B definitely not, C seems correct too. D is nonsense and E can be argued correct as well: in that region component B can be considered to be 'the solvent'

I request a second opinion from @Chestermiller

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I don’t think that E is correct.
 
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please you can explain to me why e is correct and not the a @Chestermiller
 
havenly said:
please you can explain to me why e is correct and not the a @Chestermiller
I agree with @BvU. It seems to me that both A and C are correct.
 
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