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In basic solutions, the pH value increases with increasing pressure (e.g. NH3 in water) and in acidic solutions it decreases (e.g. SO2 in water). If a reference measurement is made under normal pressure conditions, the measurement result will be correspondingly higher or lower.


If the nitrogen is truly inert, its presence will have no effect on the chemical potential of the water in the gas phase. Essentially, the gaseous water is "unaware" of the nitrogen. Consistent with this, in a mixture of ideal gases, the chemical potential of each gas is determined only by the temperature, and its partial pressure. It is ...


At $\pu{46°C}$, the vapor pressure of water in $\pu{0.1 atm}$. It means that if some water is introduced into a vacuum, in an empty container at $\pu{46°C}$, the measured pressure in the container is $\pu{0.1 atm}$. Now if water is heated to $\pu{46°C}$ in an open flask at $\pu{1 atm}$., the composition of the vapor phase is $10$% water vapor, $90$% air. The ...

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