The document summarizes a lecture on cerimetry/cerimetric titrations, which are oxidation-reduction titrations involving cerium sulfate as the oxidizing agent. Cerium sulfate is a powerful oxidant that can only be used in acidic solutions to prevent precipitation of cerium hydroxide or basic salts. The principle is that cerium sulfate in sulfuric acid acts as a strong oxidizing agent with a high oxidation potential. Ceric ammonium sulfate is commonly used as the standard solution due to its suitable solubility and approximate formula of Ce(SO4)2.2(NH4)2. SO4. 2H2O. Ceric ammonium sulfate is a strong oxidizing agent that can

1. Lecture- 15
Subject – Pharmaceutical Analysis-I
Course – B. Pharm 1st Year
Faculty Name – Umesh Kumar

2. Cerimetry/Cereometry/Cerimetric titrations
 Oxidation-Reduction titrations involving cerium sulfate
as an oxidizing agent are called as cerimetric titrations.
 Cerium sulfate is a powerful oxidant and can be used
only in acidic solution.
 In neutral solution cerium hydroxide or basic salts
precipitate.
 Cerium salts have intense yellow color and end point
detection can be possible without any indicator in hot
solutions.

3. Principle
 Ce(SO4)2 in H2SO4 medium can function as a strong
oxidizing agent and have a high oxidation potential.
 Sufficient H2SO4 is used to prevent hydrolysis and
precipitation of basic salts.
 Ceric Ammonium Sulphate is a salt of suitable solubility
for the precipitation of the standard solution has the
approximate formula Ce(SO4)2.2(NH4)2. SO4. 2H2O.

4. Conti……
 Ceric Ammonium Sulphate is a strong oxidizing agent
we can determine various reducing substances by simple
titration.
 In the presence of reducing agent it undergoes reduction
to the cerous state for ex:

6. To be continued in Next video