Chemistry Reference

Chemistry Formulas & Key Compounds Cheat Sheet

Core stoichiometry, gas laws, acid-base pH formulas, and everyday chemical names.

1. Mole Concept & Solutions

Number of Moles (n)n = Mass / Molar Mass

Avogadro's ConstantN_A = 6.022 × 10²³ mol⁻¹

Molarity (M)M = Moles of solute / V(L)

Dilution FormulaM₁V₁ = M₂V₂

Densityρ = Mass / Volume

Ideal Gas LawPV = nRT

Combined Gas Law(P₁V₁)/T₁ = (P₂V₂)/T₂

pH DefinitionpH = -log₁₀[H⁺]

pH + pOH Relation (25°C)pH + pOH = 14

Kelvin ConversionK = °C + 273.15

Baking Soda: NaHCO₃ (Sodium Bicarbonate)

Washing Soda: Na₂CO₃·10H₂O

Bleaching Powder: CaOCl₂

Plaster of Paris: CaSO₄·½H₂O

Quicklime: CaO (Calcium Oxide)

Slaked Lime: Ca(OH)₂

Vinegar (Acetic Acid): CH₃COOH

Methane (Marsh Gas): CH₄

Laughing Gas: N₂O (Nitrous Oxide)

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