RP 1 - Making up a standard solution and carrying out an acid-base titration Flashcards
What is a standard solution?
A standard solution is a solution of known concentration
How do you make a standard solution?
1) Measure, using a balance, the mass of solid require required.
2) Transfer this to a volumetric flask and rinse the remaining weighing bottle content into the flask, so no solid is lost.
3) Add a volume of distilled water to dissolve the solid. Swirl to mix.
4) Then add more distilled water up to the line on the volumetric flask. Invert multiple times to mix.
What equipment is used to carry out a titration?
- A pipette and pipette filler are used to accurately measure out the volume of a reactant before transferring it to a conical flask
- A burette is used to add small volumes of one reactant to the other reactant
How do you carry out a titration?
1) Once the pipette has been used to place one reactant into the conical flask, fill the burette with the other reactant. Record initial volume.
2) Add a few drops of indicator to the conical flask
3) Open the burette tap and allow the reactant to flow into the conical flask, swirling it to mix the content.
4) Close the burette tap once the expected colour change occurs. Use a white tile so the colour changes easy to identify.
5) Record final burette volume
6) Repeat until you get concordant results then calculate me titre
Why are acid base indicators used?
To detect when a reaction reaches completion usually by the presence of our colour change
What are concordant results?
Titres that are within 0.1cm³ of each other
