Solution Concentration Calculator
How to Use the Solution Concentration Calculator
This calculator determines various concentration units for a solution when you know the solute amount and either the total solution amount or solvent amount. Follow these steps:Step-by-Step Instructions:
- Enter Solute Compound: You can enter a chemical formula (e.g., NaCl, H2SO4), compound name (e.g., sodium chloride), or directly enter the molar mass in g/mol if known.
- Enter Solute Amount: Specify how much solute you have. You can use mass units (grams, kg, etc.) or volume units if the solute is liquid.
- Choose Solution Type: Select whether you know the total solution amount (solute + solvent) or just the solvent amount.
- Enter Amount: Enter the volume or mass of either the total solution or just the solvent, depending on your choice in step 3.
Supported Concentration Units:
| Unit | Symbol | Definition |
|---|---|---|
| Molarity | M | Moles of solute per liter of solution |
| Mass concentration | g/L | Grams of solute per liter of solution |
| Percent weight/weight | % (w/w) | Mass of solute divided by mass of solution × 100 |
| Percent weight/volume | % (w/v) | Grams of solute per 100 mL of solution |
| Parts per million | ppm | Milligrams of solute per kilogram of solution |
| Parts per billion | ppb | Micrograms of solute per kilogram of solution |
| Molality | m | Moles of solute per kilogram of solvent (when applicable) |
Examples and Use Cases
Example 1: Salt solutionYou dissolve 5.8 g of NaCl in enough water to make 100 mL of total solution.
• Step 1: Enter 'NaCl'
• Step 2: Enter '5.8' grams
• Step 3: Select 'Total solution volume/mass'
• Step 4: Enter '100' mL
Example 2: Using molar mass directly
You have 2.5 g of a compound with molar mass 180.16 g/mol dissolved in 250 mL water.
• Step 1: Enter '180.16' (molar mass)
• Step 2: Enter '2.5' grams
• Step 3: Select 'Solvent volume/mass only'
• Step 4: Enter '250' mL
Notes
- The calculator assumes solution density of approximately 1 g/mL which is the case for dilute aqueous solutions.
- Molality is always calculated by determining the solvent mass (total solution mass minus solute mass).
Troubleshooting
- Compound not recognized: Try entering the chemical formula instead of the name, or enter the molar mass directly.
- Unexpected results: Check that you've selected the correct units and amount type (solution vs solvent).
- Very large or small numbers: Results are automatically formatted in scientific notation when appropriate.
