1. Head Start 2025 Flashcards
Purpose of a volumetric flask
Makes up an accurately known volume of solution
Purpose of a volumetric pipette
Dispenses an accurately known volume (aliquot) of a solution
What is an aliquot?
An accurately known volume of a solution
Purpose of a burette
Delivers an accurately known but variable amount of solution
How many decimal places on a volume measurement made with a burette?
Two decimal places, but the second decimal place is always 0 or 5 (ie nearest 0.05mL)
What is a primary standard substance?
A substance that can be prepared pure and dissolved in water to make a solution whose concentration is accurately known
What are the features of a primary standard?
Can be made pure. Does not degrade or react with air. Known molar mass. Preferably dissolves well in water and is inexpensive.
What is a primary standard solution?
A solution containing one solute, that has been prepared by dissolving a known mass of that solute in a known volume of pure water. As a result the concentration is accurately known.
What is the name given to the solution in the burette during volumetric analysis?
Titrant
What is the name given to the solution in the conical flask during volumetric analysis?
Analyte
What name is given to the volume of titrant dispensed into the conical flask during a titration?
Titre
What is the total range of concordant titres?
0.10 mL
What is a mean titre; how is it calculated?
The average of all concordant titres in a titration experiment. Calculated to two decimal places.
Why is an indicator added to the analyte before a titration?
The indicator changes colour at or near the equivalence point. This colour change indicates the end point.
What is the equivalence point?
The point at which the exact mole ratio of reactants has been added, according to the balanced equation. At this point neither reactant is in excess.
