🧪 Chemistry Calculators

Calculate molarity, molality, moles, pH, dilution, molecular weight, gas laws and other common chemistry problems.

⚗️ Moles Calculator

Calculate the number of moles from mass and molar mass.

n = m ÷ M

Mass (g)

Molar Mass (g/mol)

Amount of Substance

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🧴 Molarity Calculator

Calculate solution concentration in mol/L.

M = n ÷ V

Moles of Solute (mol)

Solution Volume (L)

Molarity

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🧪 Molality Calculator

Calculate concentration based on kilograms of solvent.

m = moles of solute ÷ kg of solvent

Moles of Solute (mol)

Mass of Solvent (kg)

Molality

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⚛️ Molecular Weight Calculator

Enter atomic symbols and quantities to estimate molar mass.

Molar Mass = Σ(atomic mass × number of atoms)

Element 1 Atomic Mass (g/mol)

Number of Atoms

Element 2 Atomic Mass (optional)

Number of Atoms

Element 3 Atomic Mass (optional)

Number of Atoms

Molar Mass

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💧 Dilution Calculator

Calculate the final concentration using C₁V₁ = C₂V₂.

C₁V₁ = C₂V₂

Initial Concentration C₁

Initial Volume V₁

Final Volume V₂

Final Concentration C₂

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🔬 pH Calculator

Calculate pH from hydrogen ion concentration.

pH = −log₁₀[H⁺]

Hydrogen Ion Concentration [H⁺] (mol/L)

pH

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🧫 pOH Calculator

Calculate pOH from hydroxide ion concentration.

pOH = −log₁₀[OH⁻]

Hydroxide Concentration [OH⁻] (mol/L)

pOH

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🎈 Ideal Gas Law

Calculate pressure using PV = nRT.

P = nRT ÷ V

Amount n (mol)

Temperature T (K)

Volume V (L)

Pressure

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⚖️ Density Calculator

Calculate density from mass and volume.

ρ = m ÷ V

Mass (g)

Volume (mL)

Density

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📊 Percent Composition

Calculate the percentage of an element or component.

Percentage = Part ÷ Total × 100

Mass of Component (g)

Total Mass (g)

Percentage

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📚 Common Chemistry Formulas

• Moles: n = m / M
• Molarity: M = n / V
• Molality: m = mol / kg solvent
• Dilution: C₁V₁ = C₂V₂
• pH: pH = −log₁₀[H⁺]
• pOH: pOH = −log₁₀[OH⁻]
• Ideal Gas: PV = nRT
• Density: ρ = m / V
• Percentage: % = part / total × 100

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