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soluble salt preparation from insoluble base-acid neutralisationDoc Brown's Chemistry - GCSE/IGCSE/GCE (basic A level) O Level  Online Chemical Calculations

study examples carefully14. Other GCSE chemical calculationsstudy examples carefully


Spotted any careless error? EMAIL query?comment or request a type of GCSE calculation not covered?

study examples carefully14. Other GCSE miscellaneous chemical calculationsstudy examples carefully

14.1 Percentage purity of a chemical reaction product

14.1 % purity of a product calculations

14.2a Percentage yield of the product of a reaction

14.2a % reaction yield calculations

14.2b The Atom economy of a chemical reaction

14.2b atom economy calculations

14.3 Dilution of solutions calculations - calculating dilutions - volumes involved etc.

14.3 dilution of solutions calculations

14.4 Water of crystallisation in a crystallised salt

14.4 water of crystallisation calculations

14.5 Calculation of quantities required for a chemical reaction

14.5 how much of a reactant is needed? calculation of quantities required



  1. What is relative atomic mass?, relative isotopic mass and calculating relative atomic mass

  2. Calculating relative formula/molecular mass of a compound or element molecule

  3. Law of Conservation of Mass and simple reacting mass calculations

  4. Composition by percentage mass of elements in a compound

  5. Empirical formula and formula mass of a compound from reacting masses (easy start, not using moles)

  6. Reacting mass ratio calculations of reactants and products from equations (NOT using moles) and brief mention of actual percent % yield and theoretical yield, atom economy and formula mass determination

  7. Introducing moles: The connection between moles, mass and formula mass - the basis of reacting mole ratio calculations (relating reacting masses and formula mass)

  8. Using moles to calculate empirical formula and deduce molecular formula of a compound/molecule (starting with reacting masses or % composition)

  9. Moles and the molar volume of a gas, Avogadro's Law

  10. Reacting gas volume ratios, Avogadro's Law and Gay-Lussac's Law (ratio of gaseous reactants-products)

  11. Molarity, volumes and solution concentrations (and diagrams of apparatus)

  12. How to do acid-alkali titration calculations, diagrams of apparatus, details of procedures

  13. Electrolysis products calculations (negative cathode and positive anode products)

  14. Other calculations e.g. % purity, % percentage & theoretical yield, dilution of solutions (and diagrams of apparatus), water of crystallisation, quantity of reactants required, atom economy (this page)

  15. Energy transfers in physical/chemical changes, exothermic/endothermic reactions

  16. Gas calculations involving PVT relationships, Boyle's and Charles Laws

  17. Radioactivity & half-life calculations including dating materials

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