Number of Moles
n number of moles, m mass (g), M molar mass (g/mol).
n = m / M Pearson Edexcel A-Level 2025
🧪 Pearson Edexcel A-Level Chemistry Formula Sheet
Essential formulas for physical chemistry, inorganic chemistry, and organic chemistry aligned to Pearson Edexcel A-Level Chemistry (9CH0) specification.
Physical Chemistry Inorganic Organic
Master A-Level Chemistry
This formula sheet covers fundamental chemistry relationships from the Pearson Edexcel A-Level Chemistry specification, helping you solve complex problems involving thermodynamics, kinetics, and equilibria.
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Thermodynamics
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Kinetics formulas
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Equilibrium constants
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Electrochemistry
Physical Chemistry
Thermodynamics, kinetics, and equilibrium relationships.
Concentration (Molarity)
c concentration (mol/dm³), n number of moles, V volume (dm³).
c = n / V Ideal Gas Law
p pressure (Pa), V volume (m³), n moles, R gas constant (8.31 J mol⁻¹ K⁻¹), T temperature (K).
pV = nRT Equilibrium Constant
K_c equilibrium constant, products and reactants raised to stoichiometric coefficients.
K_c = [products]^coeff / [reactants]^coeff Topic Focus
Thermodynamics & Equilibrium
- Use ideal gas law with consistent units: pressure in Pa, volume in m³, temperature in K.
- Equilibrium constant shows position of equilibrium: K > 1 favors products, K < 1 favors reactants.
- Always balance chemical equations before calculating equilibrium constants.
Acids, Bases & pH
pH calculations and acid-base relationships.
pH Scale
[H⁺] hydrogen ion concentration (mol/dm³).
pH = -log₁₀[H⁺] pOH
[OH⁻] hydroxide ion concentration (mol/dm³).
pOH = -log₁₀[OH⁻] pH + pOH
At 298 K in aqueous solutions.
pH + pOH = 14 Topic Focus
pH & Acidity
- pH scale ranges from 0 (very acidic) to 14 (very basic), with 7 as neutral.
- Lower pH = higher [H⁺] = more acidic. Higher pH = lower [H⁺] = more basic.
- Each pH unit represents a 10× change in [H⁺] concentration.
How to Use This Formula Sheet
Boost your Cambridge exam confidence with these proven study strategies from our tutoring experts.
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Balance Equations First
Always balance chemical equations before doing stoichiometric calculations. Check atom counts on both sides.
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Check Units
Ensure units are consistent: convert mL to dm³, grams to moles, etc. before calculating.
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Formulas align with Pearson Edexcel A-Level Chemistry specification (9CH0) for UK students.
Always show your working, include units, and check that chemical equations are balanced.