Precise Coulometric Titration of Acids and Bases

Area of Science:

• Analytical Chemistry
• Electrochemistry

Background:

• Classical titration methods are widely used for acid-base analysis.
• There is a continuous need for improved precision and accuracy in analytical procedures.

Purpose of the Study:

• To describe apparatus and techniques for acid-base titration using constant-current coulometry.
• To evaluate the precision and accuracy of this coulometric titration method.

Main Methods:

• Constant-current coulometry was employed for acid-base titrations.
• Titrations were performed on various acids (benzoic acid, potassium acid phthalate, adipic acid, hydrochloric acid) and a base (sodium carbonate).

Main Results:

• The method demonstrated high precision and accuracy in titrating diverse acids and bases.
• Standard deviations as low as ±0.003 percent were achieved, indicating excellent reproducibility.

Conclusions:

• Constant-current coulometry provides a reliable and highly accurate alternative for acid-base titrations.
• The coulometric method's performance is comparable or superior to conventional analytical techniques.