IB Chemistry: Grade 12: Practical 1: Stoichiometry Quantitative Preparation of a Salt and Yield Calculation

Quantitative preparation of a salt and yield calculation Introduction: <Tab/>Copper (II) sulphate can be prepared by reacting copper (II) oxide with dilute sulphuric acid. The resulting copper (II) sulphate solution can then be crystallized, so that a quantitative analysis may be made of the product formed. This can then be compared with the theoretical amount, and % yield calculated. Copper (II) sulphate crystals are CuSO4.5H2O. Therefore, the reaction is: &…

…filtering. The filter paper became clogged with crystals, thus giving the solution time to cool and crystallize. Some copper sulphate may also have been lost when the crystals were dried i.e. some copper sulphate may have stuck onto the filter papers. A miscalculation while adding the limiting reagent (sulphuric acid) may have altered the results. If too little sulphuric acid were added during step one, the amount of acid would again limit the reaction.