In Chemistry what do the square brackets mean in an equilibrium expression?
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They mean concentration, usually in mol/L.
If you have K = [A][B]/[C][D], you're going to need the concentrations of A, B, C, and D to calculate K.
If you have K = [A][B]/[C][D], you're going to need the concentrations of A, B, C, and D to calculate K.
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If I am not mistaken, I believe it means concentration.
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They're just to separate the substances and make the indicies clearer to read I think :)