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Why can you use partial pressure and concentration together when calculating K or Q in the Nernst equation. Also, why can you use different units. 6N.3 combines atm and [ ], and 6N.5 combines bars and [ ]
Since K is unitless, I think that is part of why using both partial pressures and concentrations is okay in the Nernst Equation. The redox equations in these cases have both gases with partial pressures and solutions with different concentrations, so we want to use all components of the reaction when relating it to the Nernst Equation.
You can combine different values (i.e. pressure and concentration) because K is a unitless value. Therefore, if you're given concentration of some solution and pressure of a gas, you can use both to calculate Q, if they are involved in the equation for such calculation.
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