Tocris Molarity Calculator
Calculate the mass of a compound needed to prepare a solution of a given molarity and volume. Ideal for laboratory and research use.
Published by:
isCalculator Editorial Team
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How to Use the Tocris Molarity Calculator
This calculator determines the mass of solute (in grams) needed to prepare a solution of a given molarity, volume, and molecular weight.
Step-by-Step Instructions
- Enter Mass (g): Input the mass of the solute you have (optional, but required for validation). Use grams.
- Enter Volume (L): Input the desired final volume of the solution in liters (e.g., 1 L, 0.5 L).
- Enter Molecular Weight (g/mol): Input the molecular weight of the compound (e.g., 180.16 for glucose).
- Enter Desired Concentration (M): Input the target molarity in moles per liter (e.g., 0.1 M).
- Click "Calculate": The result shows the exact mass of solute required to achieve the desired concentration.
Important Notes
- All inputs must be positive numbers. Negative or zero values will trigger an error.
- Use metric units only: grams (mass), liters (volume), g/mol (molecular weight), and molar (M) for concentration.
- The formula used is: Mass (g) = Concentration (M) × Volume (L) × Molecular Weight (g/mol).
- The result is displayed with 4 decimal places for precision.
Example
To make 1 L of 0.1 M glucose (MW = 180.16 g/mol):
Mass = 0.1 × 1 × 180.16 = 18.0160 g
Previous Results
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Frequently Asked Questions
Molarity (M) is the number of moles of solute per liter of solution. It is a common unit of concentration in chemistry.
Enter the desired concentration (M), volume (L), and molecular weight (g/mol) of the compound. The calculator will compute the required mass in grams.
The calculator requires positive numbers. Invalid inputs will show an error message and the calculation will not proceed.