ChemEs Calculator
Practical Calculators for Modern Chemistry.
Molarity Calculator
Find mass, volume, concentration and stock dilutions.
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Prepare solutions with purity correction and weighing guidance.
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Convert between mass and amount with explicit units.
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Plan equivalents, limiting reagents and isolated yields.
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Explore 26 illustrated pieces of laboratory glassware.
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Molarity Calculator
Calculate mass, final solution volume, concentration or stock dilution.
Mass from concentration & volume
m = C × V × MW · C in mol/L, V in L, m in g, MW in g/mol.
Enter the required values to calculate. All quantities must be greater than zero.
Load Example uses illustrative NaCl data (MW 58.44 g/mol); dilution uses a 1 M stock.
Volume from mass & concentration
V = m / (C × MW) · C in mol/L, V in L, m in g, MW in g/mol.
Enter the required values to calculate. All quantities must be greater than zero.
Load Example uses illustrative NaCl data (MW 58.44 g/mol); dilution uses a 1 M stock.
Molarity from mass & volume
C = m / (MW × V) · C in mol/L, V in L, m in g, MW in g/mol.
Enter the required values to calculate. All quantities must be greater than zero.
Load Example uses illustrative NaCl data (MW 58.44 g/mol); dilution uses a 1 M stock.
Dilution of stock solutions
C₁V₁ = C₂V₂ · C in mol/L, V in L, m in g, MW in g/mol.
Enter the required values to calculate. All quantities must be greater than zero.
Load Example uses illustrative NaCl data (MW 58.44 g/mol); dilution uses a 1 M stock.
About ChemEs Calculator
A browser-based chemistry workbench for researchers and students. ChemEs Calculator is a provisional brand pending domain and trademark checks.
Methodology
Calculations use explicit units and supplied stoichiometric coefficients. Molecular-weight catalogue records link to PubChem; HRMS uses monoisotopic masses and stated ion corrections. Educational diagrams are original schematics, not manufacturer drawings or operating procedures. Automated tests check arithmetic and software behavior, not universal scientific correctness.
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How it works
Molar concentration is the amount of solute per final solution volume. Convert mass to moles using molecular weight before calculating concentration. Stock dilution conserves the amount of solute.
Formula: M = n / V; n = m / MW; C₁V₁ = C₂V₂. Use m in g, MW in g/mol, n in mol and V in L for concentration in mol/L.
Worked example: 100 mM NaCl in 100 mL: (0.100 mol/L) × (0.100 L) × (58.44 g/mol) = 0.5844 g = 584.4 mg. Dissolve, then adjust to 100 mL final volume.
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