# Equilibrium - Pressure Vs. Concentration [closed]

Does increasing the pressure increase the concentration of reactants as well?

If: $$\ce{A(g) + B(g)<=>C(g) + D(g)}$$

Assuming all reactants and products are gases.

According to Le Chatelier's Principle, increasing the pressure will cause the system to shift wherever has the least amount of gaseous molecules. However, in this case, the molar ratios are 1:1; thus, increasing the pressure will not cause a shift. That being said, when the pressure is increased, does the concentration of reactants and products both go up? Or do they maintain the same.

Thanks!

## closed as off-topic by andselisk♦, Mithoron, Todd Minehardt, Tyberius, aventurinFeb 22 at 6:12

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• There are some cases where le chateliers fails if you follow typical wisdom. It is better to approach it quantitatively using differential sensitivity analysis. This is probably out of the scope of the question, but it works every time. – Charlie Crown Feb 22 at 3:17
• See the following for a prime example of why you can't just follow Le Chateliers principle blindly... researchgate.net/publication/… – Charlie Crown Feb 22 at 3:26