Advanced Salt Concentration Calculator

Calculator Inputs

Salt Preset

Choose a common salt or use a custom entry.

Custom Salt Name

Shown in results and exports.

Molar Mass (g/mol)

Used to convert grams into moles.

Equivalent Factor

Used for approximate normality.

Dissociation Factor

Used for approximate osmolarity.

Salt Mass (g)

Enter the dissolved salt mass.

Solution Volume (mL)

Needed for molarity, g/L, and % w/v.

Solvent

Used for mole fraction calculations.

Custom Solvent Molar Mass (g/mol)

Used only when custom solvent is selected.

Solvent Mass (g)

Needed for molality and mole fraction.

Solution Density (g/mL)

Lets the calculator derive total solution mass.

Plotly Graph

Submit valid values with a solution volume to generate the dilution trend graph.

Example Data Table

Salt	Salt Mass (g)	Volume (mL)	Solvent Mass (g)	Molarity (mol/L)	Molality (mol/kg)	Mass %
Sodium Chloride (NaCl)	5.844	500	494.156	0.2	0.20237	1.14588
Potassium Chloride (KCl)	7.455	250	242.545	0.4	0.41229	2.89515
Calcium Chloride (CaCl₂)	11.098	1000	988.902	0.1	0.10112	1.06712

These examples show common inputs and representative outputs for quick comparison.

Formula Used

Moles of salt: moles = salt mass ÷ molar mass

Molarity: molarity = moles of solute ÷ solution volume in litres

Molality: molality = moles of solute ÷ solvent mass in kilograms

Mass concentration: g/L = salt mass in grams ÷ solution volume in litres

Mass percent: % w/w = (salt mass ÷ total solution mass) × 100

Weight/volume percent: % w/v = (salt mass ÷ solution volume in mL) × 100

PPM: ppm = (salt mass ÷ total solution mass) × 1,000,000

Normality: normality = molarity × equivalent factor

Approximate osmolarity: osmolarity = molarity × dissociation factor

Mole fraction of solute: x_solute = solute moles ÷ total moles

Normality and osmolarity depend on your selected factors. They are approximation tools and should match the reaction or dissociation model you intend.

How to Use This Calculator

Select a preset salt or choose the custom option.
Confirm or enter the molar mass, equivalent factor, and dissociation factor.
Enter the dissolved salt mass in grams.
Enter the final solution volume for molarity-based outputs.
Enter solvent mass when you need molality or mole fraction.
Add solution density when you want mass percent and ppm from total solution mass.
Press the calculate button.
Review the result cards, graph, and summary table.
Use the CSV or PDF buttons to export the current report.

Frequently Asked Questions

1) What does this calculator measure?

It converts the same salt solution into several chemistry concentration units, including molarity, molality, normality, mass percent, ppm, g/L, and mole fraction.

2) Why are molarity and molality different?

Molarity uses final solution volume. Molality uses solvent mass only. Because volume changes with temperature and mixing, the two values can differ.

3) When should I enter solution density?

Enter density when you want the calculator to estimate total solution mass from volume. This helps compute mass percent and ppm on a mass basis.

4) What is the equivalent factor field for?

It is used to estimate normality from molarity. The correct factor depends on the reaction context, not only the salt formula.

5) Is ppm the same as mg/L?

Not always. In dilute aqueous solutions they are often treated as nearly equal, but this page reports ppm on a mass basis and mg/L from volume.

6) Can I use a custom salt?

Yes. Choose the custom salt option, type a label, then enter the correct molar mass, equivalent factor, and dissociation factor for your case.

7) What does the graph show?

The graph shows a dilution trend. It keeps the same salt amount and calculates how molarity changes as the final solution volume increases.

8) Why might some outputs say not available?

Some units need specific data. For example, molality needs solvent mass, while mass percent and ppm need a valid total solution mass basis.