ACTIVITY 2
1. Define the following terms:
a. Titrimetric analysis
Titrimetric analysis is a method of analysis in which a solution of the substance being
determined is treated with a solution of a suitable reagent of exactly known concentration. The reagent
is added to the substance until the amount added is equivalent to the amount of substance to be
determined.
b. Analyte
An analyte, component, or chemical species is a substance or chemical constituent that is of
interest in an analytical procedure. The purest substances are referred to as analytes. Example: 24 karat
gold, NaCl, water, etc.
c. Titrant
Titration is a common laboratory method of quantitative chemical analysis to determine the
concentration of an identified analyte. A reagent, termed the titrant or titrator, is prepared as a
standard solution of known concentration and volume.
d. Indicator
chemical indicator, any substance that gives a visible sign, usually by a color change, of the
presence or absence of a threshold concentration of a chemical species, such as an acid or an alkali in a
solution. An example is the substance called methyl yellow, which imparts a yellow color to an alkaline
solution.
e. End point
The experimental point at which the completion of the reaction is marked by some signal is
called the end point. This signal can be the color change of an indicator or a change in some electrical
property that is measured during the titration.
f. Stoichiometric point
The equivalence point, or stoichiometric point, of a chemical reaction is the point at which
chemically equivalent quantities of reactants have been mixed. For an acid-base reaction the
equivalence point is where the moles of acid and the moles of base would neutralize each other
according to the chemical reaction.
g. Equivalent weight
equivalent weight, in chemistry, the quantity of a substance that exactly reacts with, or is equal
to the combining value of, an arbitrarily fixed quantity of another substance in a particular reaction. The
equivalent weight of an element is its gram atomic weight divided by its valence (combining power).
