Acid-Base Titrations (4.3.1) Flashcards
• Titration is used to determine the number of moles of an unknown by adding a known amount of reagent that reacts with the unknown stoichiometrically.
• Titration is used to determine the number of moles of an unknown by adding a known amount of reagent that reacts with the unknown stoichiometrically.
• An acid-base titration involves the addition of a known volume of a basic (or acidic) substance of known concentration to a known volume of an acidic (or basic)
solution of unknown concentration.
• An acid-base titration involves the addition of a known volume of a basic (or acidic) substance of known concentration to a known volume of an acidic (or basic)
solution of unknown concentration.
Titration is the method used to determine the
number of moles of an unknown by adding a known
amount of reagent that reacts with the unknown
stoichiometrically.
Titrations can involve acid-base reactions and
oxidation-reduction reactions.
Titration is the method used to determine the
number of moles of an unknown by adding a known
amount of reagent that reacts with the unknown
stoichiometrically.
Titrations can involve acid-base reactions and
oxidation-reduction reactions.
An acid-base titration involves the addition of a
known volume of a basic (or acidic) substance of
known concentration to a known volume of an acidic
(or basic) solution of unknown concentration.
In an acid-base titration an indicator is employed
that changes color when the equivalence point is
reached for the titration. This equivalence point is
reached when the acid (or base) completely
neutralizes the base (or acid) of the sample.
In the example, to determine the unknown amount
of oxalic acid in the sample, it is titrated with a
known volume (34.47 mL) of a basic solution
(NaOH) of a known concentration (0.485 M).
For the calculations it is important to recognize that
oxalic acid is a diprotic acid, one mole of acid can
neutralize two moles of base.
An acid-base titration involves the addition of a
known volume of a basic (or acidic) substance of
known concentration to a known volume of an acidic
(or basic) solution of unknown concentration.
In an acid-base titration an indicator is employed
that changes color when the equivalence point is
reached for the titration. This equivalence point is
reached when the acid (or base) completely
neutralizes the base (or acid) of the sample.
In the example, to determine the unknown amount
of oxalic acid in the sample, it is titrated with a
known volume (34.47 mL) of a basic solution
(NaOH) of a known concentration (0.485 M).
For the calculations it is important to recognize that
oxalic acid is a diprotic acid, one mole of acid can
neutralize two moles of base.
The purity of the oxalic acid sample is determined
(the amount of oxalic acid divided by the amount of
the total sample) by converting the volume of NaOH
titrated into moles of hydroxide ion.
Moles of hydroxide ion are converted into moles of
oxalic acid using the 2:1 ratio for a diprotic acid.
The molar mass of oxalic acid is used to convert the
moles of oxalic acid into mass and the percent
purity of the sample is estimated by dividing the
mass of oxalic acid by the mass of the total sample
and multiplying by 100.
The purity of the oxalic acid sample is determined
(the amount of oxalic acid divided by the amount of
the total sample) by converting the volume of NaOH
titrated into moles of hydroxide ion.
Moles of hydroxide ion are converted into moles of
oxalic acid using the 2:1 ratio for a diprotic acid.
The molar mass of oxalic acid is used to convert the
moles of oxalic acid into mass and the percent
purity of the sample is estimated by dividing the
mass of oxalic acid by the mass of the total sample
and multiplying by 100.
