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Chemistry Forums for Students => Physical Chemistry Forum => Topic started by: ayl08 on February 26, 2013, 08:00:15 AM

Title: What is vapour pressure? Aqueous ammonia under pressure
Post by: ayl08 on February 26, 2013, 08:00:15 AM

I have a system where aqueous ammonia is heated under pressure.
Solubility of ammonia drops from 33% at 0°C to 16% at 60°C at normal atmospheric pressure.
The system is under pressure of 10 bars.
Can I predict how much ammonia remain dissolved in solution?
If so, how?

Title: Re: What is vapour pressure? Aqueous ammonia under pressure
Post by: Schrödinger on March 01, 2013, 03:23:53 AM

I think you can, using Henry's law. Although the law is stated for constant Temperature conditions, you should be able to incorporate the temperature dependence of the Henry's constant into the equation. There is a small sub section on this in wikipedia