GCSE Chemistry Specification

OCR B J258

Section C5.4: How are the amounts of chemicals in solution measured?

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#C5.4.1

identify the difference between qualitative and quantitative analysis

#C5.4.2

explain how the mass of a solute and the volume of the solution is related to the concentration of the solution and calculate concentration using the formula:

\(\text{concentration } (g/dm^3) = \dfrac{\text{mass of solute } (g)}{\text{volume } (dm^3)}\)

#C5.4.3

explain how the concentration of a solution in mol/dm3 is related to the mass of the solute and the volume of the solution and calculate the molar concentration using the formula :

\(\text{concentration } (mol/dm^3) = \dfrac{\text{moles of solute}}{\text{volume } (dm^3)}\)

#C5.4.4

describe neutralisation as acid reacting with alkali to form a salt plus water including the common laboratory acids hydrochloric acid, nitric acid and sulfuric acid and the common alkalis, the hydroxides of sodium, potassium and calcium

#C5.4.5

recall that acids form hydrogen ions when they dissolve in water and solutions of alkalis contain hydroxide ions

#C5.4.6

recognise that aqueous neutralisation reactions can be generalised to hydrogen ions reacting with hydroxide ions to form water

#C5.4.7

describe and explain the procedure for a titration to give precise, accurate, valid and repeatable results
PAG6

#C5.4.8

Evaluate the quality of data from titrations

#C5.4.9

explain the relationship between the volume of a solution of known concentration of a substance and the volume or concentration of another substance that react completely together