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Can I find the molality of a solution if I have the molarity and the density?

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lxsptter | Student, Undergraduate | (Level 2) Valedictorian

Posted September 15, 2011 at 12:17 PM via web

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Can I find the molality of a solution if I have the molarity and the density?

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justaguide | College Teacher | (Level 2) Distinguished Educator

Posted September 15, 2011 at 12:32 PM (Answer #1)

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Molality is a way of measuring the concentration of a compound dissolved in a solution. If a solution has a molality of one, there is one mole of the solute dissolved in one kilogram of the solution. Molarity on the other hand is concentration expressed in moles per liter of the solution.

If you have the molarity and density of a solution you can calculate the molality of the solution.

Let molality be denoted as M', M' = mol/kg and M denote molarity, M = mol/liter

Density D = kg/liter

M/D = (mol/liter)/(kg/liter) = mol/kg = M'

The molality of a solution can be derived by dividing the molarity of the solution by its density.

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shihan | Student, Undergraduate | (Level 1) Salutatorian

Posted October 10, 2011 at 10:27 PM (Answer #2)

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The molality of a solution can be derived by dividing the molarity of the solution by its density.

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