This lesson will define reaction rate as the change in concentration of products (molarity) in a chemical reaction over time.

Tutorial illustrating the ideas of solutions and discussing molarity, molality, and mass percent. Also, why polar solvents dissolve polar solutes, and nonpolar solvents dissolve nonpolar solutes. [8:21]

A video lecture investigating how to solve problems using stoichiometry. The lecture shows viewers step-by-step how to solve for the mass needed of a substance in order for it to completely react with a solution. [10:18]

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 the difference between molarity and molality differ. Rishi is a pediatric infectious disease physician and works at Khan Academy. [8:00]

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]

Learn how to calculate the unknown concentration with titration. See an example of titrating strong acid, hydrochloric acid, with strong base barium hydroxide. [7:49]

The video reviews over a free response from an AP exam where students were asked to calculate the molar solubility of calcium hydroxide in a 0.10 M calcium nitrate solution [9:19]