Molarity, Molality, Osmolarity, Osmolality, and Tonicity

Clinic A/P, adults, Hospital A/P, Adults

  • Molarity = Moles / 1 Liter Solvent.
  • Molality = Moles / 1 Kg Solvent.
  • Osmolarity = Osmoles / 1 Liter Solution
  • Osmolality = Osmoles / 1 kg / Solvent

Molarity, Molality, Osmolarity, and Osmolality define or describe one solution.

Tonicity (hypo, iso, hyper-tonic) is a word used to compare two solutions.

Serum Osmolality = (2Na+) + (glucose / 18) + (BUN / 2.8)  = 285 (normally)

 

Check out this Khan academy’s series: Lab values and concentrations

https://www.khanacademy.org/science/chemistry/atomic-structure-and-properties/introduction-to-the-atom/v/atomic-weight-and-atomic-mass

http://www.indiana.edu/~nimsmsf/P215/p215notes/LabManual/Lab5.pdf

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