Problem: What is the osmolarity of a 0.20 M solution of KCl?

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We’re being asked to calculate the osmolarity of a 0.20 M solution of KCl. Recall that molarity is the ratio of the moles of solute and the volume of solution (in liters)


Since the KCl is an ionic compound, it forms ions when dissociating in water. The dissociation of NaCl in water is as follows:

KCl(s)  K+(aq) + Cl(aq)


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What is the osmolarity of a 0.20 M solution of KCl?

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