Chemistry: m or M? Difference Between Molarity and Molality

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m or M? Difference Between Molarity and Molality Aug 23rd 2011, 09:10 If you pick up a stock solution from a shelf in the lab and it's 0.1 m HCl, do you know if that's a 0.1 molar solution or 0.1 molal solution or if there is even a difference? The lower case m indicates molality, which is calculated using moles of solute per kilograms of solvent. Upper case M is molarity, which is moles of solute per liter of solution (not solvent). If your solvent is water at room temperature m and M can be roughly the same, so if an exact concentration doesn't matter, you can use either solution. Molarity is more common, because most solutions are made by measuring solutes by mass and then diluting a solution to the desired concentration with a liquid solvent. Calculate Molarity & Molality | Example Molarity Problems

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