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Saponification Value Calculator.

Calculate saponification value from potassium hydroxide consumed and sample mass.

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Saponification value: 190 mg KOH/g

Saponification value

190.000000mg KOH/g

Educational formula calculator. Keep units consistent and verify assumptions against your laboratory or course specification.

Use Cases

Soap Making

Soap makers use saponification value to calculate the exact amount of lye needed to saponify oils, ensuring a balanced, non-caustic soap.

Example: If 200 mg KOH is consumed by 1.5 g of oil, the saponification value is 133.3 mg KOH/g.

Quality Control in Food Industry

Analysts measure saponification value to verify the purity and composition of edible oils, detecting adulteration or degradation.

Example: A sample of coconut oil with a saponification value of 250-260 mg KOH/g indicates high quality.

Frequently Asked Questions

What is saponification value?
Saponification value is the amount of potassium hydroxide (KOH) in milligrams needed to saponify one gram of fat or oil. It indicates the average molecular weight of the fatty acids in the sample.
How is saponification value calculated?
It is calculated by dividing the mass of KOH consumed (in mg) by the sample mass (in g). The result is expressed in mg KOH per gram of sample.
Why is saponification value important?
It helps determine the suitability of fats and oils for soap making, biodiesel production, and quality control in food and cosmetic industries. Higher values indicate shorter fatty acid chains.

Tips & Common Mistakes

Tips

  • Ensure the KOH consumed is measured accurately in milligrams; even small errors can significantly affect the result.
  • Use a precisely weighed sample mass in grams; the more accurate the mass, the more reliable the saponification value.
  • Perform the titration in duplicate or triplicate to confirm consistency and reduce experimental error.
  • Record the temperature and conditions of the test, as saponification value can vary with temperature and sample purity.

Common Mistakes to Avoid

  • Using the wrong units: KOH consumed must be in mg and sample mass in g, otherwise the result will be incorrect.
  • Not accounting for the purity of KOH: if the KOH is not pure, the actual consumed amount may differ, leading to errors.
  • Confusing saponification value with acid value or iodine value; they measure different properties of fats and oils.

Last updated: August 13, 2026