Khan Academy: Molarity, Molality, Osmolarity, Osmolality, and Tonicity

See how each of these terms (molarity, molality, osmolarity, osmolality, tonicity) tells us something different about a solution in the Khan Academy video. [4:03]

See how each of these terms tells us something different about a solution.

Molarity and osmolarity are two distinct concepts. Molarity (M) is the number of moles of solute per liter of solution. The unit of molarity is the mole (mol). Osmolarity (Osm/L) is the total concentration of all solutes in the solution....

Learn the definitions of a solution, solute, and solvent. Understand how molarity is used to quantify the concentration of solute, and comcalculations related to molarity.

Video lesson looks at hypotonic, isotonic and hypertonic solutions (tonicity) and seeing the effect of various types of solution on the direction of osmosis. [6:29]

Learn about osmoles and figure out how to calculate osmolarity really easily with this video lecture. Video describes how these calculations are used in a medical lab setting. [11:32]

Learn how molarity and molality differ. The molality of a solution is equal to the moles of solute divided by the mass of solvent in kilograms, while the molarity of a solution is equal to the moles of solute divided by the volume of...

Find out how tonicity is determined by ions that don't move across membranes and how it affects the movement of water. Rishi is a pediatric infectious disease physician and works at Khan Academy. [11:02]

Learn how to use three lab values (Sodium, glucose, and BUN) to approximate your plasma osmolarity. Rishi is a pediatric infectious disease physician and works at Khan Academy. [12:57]

A video lecture discussing the properties of homogeneous mixtures and how to distinguish between the different types. Understand that homogeneous mixtures that have large particles that eventually settle to the bottom are known as a...