C6 - Titrations Flashcards
What is the purpose of titrations and what reactions are they used with?
They are used to check the purity of acidic or alkaline products and they work using neutralisation reactions.
How does the titration work?
Add a known volume of alkali to a titration flask, along with two or three drops of indicator.
Fill the burette with the acid.
The volume should be indicated with the marks down the side.
Using the burette, Add the acid one bit at a time and give the conical flask a swirl, going slow when the end-point, (colour change), is in sight.
The indicator will change colour when all of the alkali is neutralised.
Record the volume of acid used.
How are solids broken down for titrations?
Solid lumps are crushed into a powder before weighed in a titration flask on the balance. A solvent such as water or ethanol is added to dissolve the powder before the flask is swirled to finish the dissolving.
