Paper 3: Required practical 1 - Making up a standard solution and carrying out an acid base titration

• Measure using a balance the mass of solid required • Transfer this into a volumetric flask and rinse the remaining weighing bottle content (with distilled water) into the flask so no solid is lost • Add a volume of distilled water to dissolve the solid - swirl to mix • Add more distilled water up to the line on the volumetric flask • Invert mulitple times to mix

• Pipette and pipette filler - accurately measure out the volume of a reactant before transferring it to a conical flask • Burette - add small volumes of one reactant to the other reactant (until the reaction has reached completion)

• Once the pipette has been used to place on reactant into the conical flask, fill the burette with the other reactant - record initial volume • Add a few drops of indicator to the conical flask • Open the burrette rap and allow the reactant to flow into the conical flask, swirling it to mix the contents • Close the burette tap once the expected colour change occurs - use a white tile so the colour change is easy to identify • Record the final burette volume • Repeat until you get concordant results, then calculate a mean titre

To detect when a reaction reaches completion, usually by the presence of a colour change

Titres that are within 0.1 cm^3 of each other