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1. Reminders - what is molarity?

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Titration index  *  Full chemistry calculations index

Quiz 12 The basics of acid-alkali titration calculations Good exam practice questions for GCSE level

1. Introduction - reminders of what molarity is

  • This page is all about a quantitative chemical procedure called a titration.
    • We use a titration technique to find out exactly, the concentration of a specified solute in solution.
    • e.g. you can find out precisely how much of an acid solution (this volume is called the titre) is needed to neutralise an accurately measured out volume of an alkali, or the other way round.
    • e.g. if you know the concentration of the acid, together with this, and the two volumes of the solutions required for neutralisation, you can calculate the unknown concentration of the other alkaline solution.
    • How to do titrations to find the concentration of an acid or alkali from the relative volumes used and the concentration of one of the two reactants are described in the method and apparatus in section 2.
  • Before studying this section you should work your way through section chemical calculations section 11. Molarity, volumes and solution concentrations
  • You should be able to carry out calculations involving neutralisation reactions in aqueous solution given the balanced equation or from your own practical results.
  • The examples in section 7. moles and mass. and section 11. concentration will help you follow the calculations below.
    • Note again: 1dm3 = 1 litre = 1000ml = 1000 cm3, so dividing cm3/1000 gives dm3.
    • and other useful formulae or relationships are:
      • molarity (mol/dm3) = mol / volume (dm3 = cm3/1000),
      • moles = molarity (mol/dm3) x volume (dm3 = cm3/1000),
      • volume = moles / molarity
      • 1 mole = formula mass in grams.
    • In most volumetric calculations of this type, you first calculate the known moles of one reactant from a volume and molarity.
    • Then, from the equation, you relate this to the number of moles of the other reactant, and then with the volume of the unknown concentration, you work out its molarity.
  • I haven't quoted separately the atomic masses used in the titration calculations, but they quoted as part of the calculation and its pretty obvious what is what!

Titration index  *  Full chemistry calculations index

Quiz 12 The basics of acid-alkali titration calculations Good exam practice questions for GCSE level

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