Molarity of Aqueous Salt Solutions

Initializing live version
Download to Desktop

Requires a Wolfram Notebook System

Interact on desktop, mobile and cloud with the free Wolfram Player or other Wolfram Language products.

Input the mass of solute and the volume of the resulting solution to calculate the molarity (M, in moles/liter) of several common water-soluble salts. The number of moles equals the mass divided by the molecular weight MW. Generally, since the volume of the solution is only very slightly changed by addition of solute, it is usually a sufficiently accurate approximation to compute molarity as moles of solute divided by volume of solvent.


In highly accurate work, an alternative measure of concentration, molality, can be used. The molality is given by moles of solute per kg of solvent and so does not depend on the variation of solution volume with temperature or with addition of solute. In this case, the solvent volume in mL is reinterpreted as solvent mass in g.


Contributed by: S. M. Blinder (July 2008)
Open content licensed under CC BY-NC-SA




Feedback (field required)
Email (field required) Name
Occupation Organization
Note: Your message & contact information may be shared with the author of any specific Demonstration for which you give feedback.