EXERCISE 6: TITRATION Flashcards
is a quantitative method in which an unknown amount or
concentration of a substance (analyte) is calculated through a chemical reaction with a known concentration of
reagent (titrant).
VOLUMETRIC ANALYSIS
(also called volumetric titration)
unknown amount or
concentration of a substance
ANALYTE
known concentration of
reagent
TITRANT
TRUE OR FALSE
Equivalence point cannot be determined experimentally.
TRUE
estimate by observing some physical change
position of physical change associated with the condition of chemical equivalence
end point
often added to the analyte solution to produce an observable physical change
indicators
Large changes in the relative concentration of analyte or titrant occur in the
equivalence point region
The accuracy of a titration lies on
accuracy of the concentration of the titrant
TRUE OR FALSE
Preparing solutions of NaOH with known concentration is difficult
TRUE, because solid NaOH is very hygroscopic
and absorbs CO2 from the atmosphere.
standardize NaOH against a primary standard acid, which is
potassium hydrogen phthalate (KHP)
Carbon dioxide reacts with NaOH in solution to form ——–, which is a weak base.
carbonate ion (CO3^2-)
It is removed by boiling distilled water for 5-10
minutes and cooling.
CO2
When performing titrations using KHP, ———————– is suitable as an endpoint indicator.
phenolphthalein
A way of determining acid or base concentration in a solution
TITRATION
