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Estimation of Sodium benzoate by Non aqueous titration

Estimating the amount of sodium benzoate in a non-aqueous solution can be achieved by using non-aqueous titration. Here are the steps to estimate the amount of sodium benzoate using non-aqueous titration:

  1. Preparation of the sample solution: Weigh accurately about 0.1-0.2 g of the sodium benzoate sample and dissolve it in 25 ml of non-aqueous solvent such as methanol or ethanol. Mix it well.
  2. Preparation of titrant solution: Prepare a standard solution of a strong base like potassium hydroxide (KOH) in a non-aqueous solvent such as methanol or ethanol. The concentration of the titrant should be known and verified.
  3. Titration: Add a few drops of phenolphthalein indicator to the sample solution. Phenolphthalein turns pink in the presence of a base. Titrate the sample solution with the standardized KOH solution until the pink color persists for at least 30 seconds. The volume of KOH solution used is noted.
  4. Calculation: The amount of sodium benzoate in the sample can be calculated using the following formula:

Amount of sodium benzoate = (volume of KOH solution x normality of KOH x molecular weight of sodium benzoate) / weight of the sample

Where, normality of KOH = (concentration of KOH x 1000) / molecular weight of KOH

The molecular weight of sodium benzoate is 144.1 g/mol, and the molecular weight of KOH is 56.11 g/mol.

By using this method, one can estimate the amount of sodium benzoate present in a non-aqueous solution accurately.

First Year B Pharm Notes, Syllabus, Books, PDF Subjectwise/Topicwise

F Y B Pharm Sem-IF Y B Pharm Sem-II
BP101T Human Anatomy and Physiology I TheoryBP201T Human Anatomy and Physiology II – Theory
BP102T Pharmaceutical Analysis I TheoryBP202T Pharmaceutical Organic Chemistry I Theory
BP103T Pharmaceutics I TheoryBP203T Biochemistry – Theory
BP104T Pharmaceutical Inorganic Chemistry TheoryBP204T Pathophysiology – Theory
BP105T Communication skills TheoryBP205T Computer Applications in Pharmacy Theory
BP106RBT Remedial BiologyBP206T Environmental sciences – Theory
BP106RMT Remedial Mathematics TheoryBP207P Human Anatomy and Physiology II Practical
BP107P Human Anatomy and Physiology PracticalBP208P Pharmaceutical Organic Chemistry I Practical
BP108P Pharmaceutical Analysis I PracticalBP209P Biochemistry Practical
BP109P Pharmaceutics I PracticalBP210P Computer Applications in Pharmacy Practical
BP110P Pharmaceutical Inorganic Chemistry Practical
BP111P Communication skills Practical
BP112RBP Remedial Biology Practical

Suggested readings:

  • Assay of Sodium benzoate by non-aqueous titration Pharm Analysis Lab
  • Solvents in Non aqueous titration
  • Preservatives in cosmetics
  • 1.3 Medicinal Biochemistry Pharm D Syllabus, Notes, PDF, Books, Downloads
  • Acidimetry and alkalimetry titration in Non aqueous titration

B Pharmacy Notes (Subjectwise/Topicwise)

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