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Concentration is moles/liters, and we can't have a negative amount of moles or a negative volume (liters). Thus, the numerator and denominator will always be positive so concentration will always be positive. Hope this helps!
A concentration or Molarity is the number of moles per Liter. It is not possible to have a concentration that is less than zero because this would imply that it is possible to have a negative number of moles or liters.
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