Purification and Measuring Yield

Purification and Measuring Yield

1. Isolating the product and purification use similar techniques

   • FILTRATION: Used to seperate an insoluble solid from a liquid. Filtration can be used in purification as solid impurities may need to be rmeoved from the reaction solution. It can also be used to isolate the product.
   • EVAPORATION AND CRYSTALLISATION: Heating up the solution causes the solute to evaporate leaving behind solid crystals of the product. The crystals have a regular structure that the impurities cant fit into. This process is often repeated over and over again to improve the purity. Products are dissolved and then crystallised again which is called recrystallisation
   • DRYING: The product can be dried in a drying oven. Some simply heat the sample but others are more like hairdriers - they blow hot dry air over the product. Products are also dried using desiccators. These are containers that contain chemicals like silica gel that remove water from their surroundings that keep the product dry

2. Percentage Yield Compares Actual Yield and Theoretical Yield

   • Percentage Yield = Actual Yield (g) / Theoretical Yield x 100