Analytical Techniques Flashcards
A volumetic flask is…
the apparatus used to make up a solution to an accurately known volume
A volumetric pipette is…
the apparatus used to dispense an accurately known volume (aliquot)
An aliquot is…
an accurately known volume of a solution
A burette is…
the apparatus used to deliver an accurately known but variable volume of solution
measurements are made to the nearest 0.05mL
A primary standard is…
a substance that can be prepared pure and dissoled in water to make a solution that has an accurately known concentration
A primary standard solution is…
a solution containing one solute, prepared by dissolving a known mass of that solute into a known volume of water
the concentration is known accurately
Volumetric analysis is…
a quantitative analysis technique using volume as the principal measurement
A titrant is…
the solution in the burette, dispensed into the conical flask
The analyte is…
the solution in the conical flask, which has a known volume
The titre is…
the volume of titrant dispensed into the conical flask during a titration
calculated to the nearest 0.05mL
Concordant titres are…
titres within a total range of 0.10mL during one titration experiment
The mean titre is…
the average of all concordant titres in a titration experiment
calculated to two decimal places
The dilution factor is…
the final volume divided by the inital volume, where water has been added to dilute the solution
An indicator is…
a substance that changes colour at or near the equivalence point, often due to a change in pH
The equivalence point occurs when…
the exact mole ratio of reactants has been added (according to the balanced chemical equation)
neither reactant is in excess
The end point occurs when…
observable experimental evidence shows that the equivalence point has been reached
A titration curve is…
a graph plotting pH against volume of titrant added
A mistake is…
an avoidable error that may cause the experimental result to be inaccurate
experimental results involving mistakes should always be rejected