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# 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

The fomulas used by the calculater is given in the table below:

For full table - rotate the screen!

 Molality Molarity Mole fraction g solute/l solution Desired unit  - as function of Wt% 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]

### Descriptive Terms for Solubility

Descriptive TermParts 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

## Related Topics

• Basics - The SI-system, unit converters, physical constants, drawing scales and more.
• Miscellaneous - Engineering related topics like Beaufort Wind Scale, CE-marking, drawing standards and more.

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## Citation

• Engineering ToolBox, (2017). Concentration Units Converter . [online] Available at: https://www.engineeringtoolbox.com/molarity-molality-mole_fraction-weight_percent-grams_solute_liter_solution-conversion-formula-calculator-d_1998.html [Accessed Day Mo. Year].

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