Concentration Units Converter
Calculator and formulas for conversion between different units of concentration: Molarity, molality, mole fraction, weight percent of solute and grams of solute per liter of solution - descriptive terms for solubility.
Online Units Concentration Calculator
The calculator below can be used to convert between common concentration units. The mole weight of the solvent and solute and the density of the solution must be filled in:
Mole weight solvent, g/mol
Mole weight solute, g/mol
Density solution, g/ml
(not needed for conversons between wt%, mole fraction and molality or between molarity and g solute/l solution)Concentration value (choose the unit you have below)
wt% solute
mol/kg solvent (molality)
mol/l solution (molarity)
mol solute/mol total (mole fraction)
g solute/l solution
Density of water solutions of: organic acids, organic substances as sugars and alcohols, inorganic chlorides, inorganic sodium salts, inorganic potassium salts and some other inorganic substances.
See also Solutions, molarity and dilution, Mixtures, Solutions and Suspensions and Solubility product constants.
The fomulas used by the calculater is given in the table below:
For full table - rotate the screen!
| Desired unit - as function of | Wt% | Molality | Molarity | Mole fraction | g solute/l solution |
|---|---|---|---|---|---|
| Wt% of solute | 100*E*B 1000 + E*B |
F*B 10*C |
100*G*B G*B + (1 - G)*A |
H 10*C |
|
| Molality, mol/kg solvent | 1000*D B*(100 - D) |
1000*F 1000*C - F*B |
1000*G A - G*A |
1000*H B*(1000*C - H) |
|
| Molarity, mol/liter solution | 10*C*D B |
1000*C*E 1000 + B*E |
1000*C*G G*B + (1 - G)*A |
H B |
|
| Mole fraction, molsolute/moltotal | D/B D/B + (100 - D)/A |
A*E A*E + 1000 |
A*F F*(A - B) + 1000*C |
A*H H*(A - B) + 1000*C*B |
|
| Gram of solute/liter solution | 10*D*C | 1000*C*E*B 1000 + E*B |
F*B | 1000*C*G*B G*B + (1-G)*A |
where
A = mole weight of solvent, g/mol
B = mole weight of solute, g/mol
C = density of solution*, g/ml
D = wt% of solute
E = molality, mol/kg solvent
F = molarity, mol/liter solution
G = mole fraction, molsolute/moltotal
H = gram of solute/liter solution
* Density is not needed for conversons between wt%, mole fraction and molality or between molarity and grams of solute per liter solution.
Density of low viscous liquids can be measured by exact weighing of a well-defined volume of the liquid. Then, the density is calculated by using the formula
density = mass [g]/volume [ml]
Density of water solutions of: organic acids, sugar and alchohols, inorganic chlorides, inorganic potassium salts, inorganic sodium salts, other common inorganic substanses
Shrinkage and estimation of density of a liquid-liquid solution
How to measure density of petroleum products
Descriptive Terms for Solubility
| Descriptive Term | Parts of solvent required for 1 part of solute |
|---|---|
| Very soluble | < 1 |
| Freely soluble | 1 < 10 |
| Soluble | 10 < 30 |
| Sparingly soluble | 30 < 100 |
| Slightly soluble | 100 < 1000 |
| Very slightly soluble | 1000 < 10000 |
| Pracically insoluble (Insoluble) | > 10000 |