Percent Purity Calculator
Calculate the percent purity of a substance using direct mass measurements or titration data. This calculator determines the percentage of pure substance in a sample, the mass of impurities, and classifies the purity grade.
Percent purity is a measure of how much of a sample is composed of the desired substance versus impurities. It is calculated as % purity = (mass of pure substance / mass of sample) × 100. In analytical chemistry, purity is a critical quality metric for reagents, pharmaceuticals, and industrial chemicals.
When direct mass measurement is not possible, titration provides an indirect method to determine purity. A sample of known mass is dissolved and titrated with a standard solution of known concentration. The volume of titrant consumed at the equivalence point is used to calculate the moles of analyte, which is then converted to mass using the molar mass and stoichiometric ratio.
Chemical reagents are classified by purity grade. Analytical grade (≥99.5%) is required for quantitative analysis and research. Reagent grade (≥99.0%) is suitable for most laboratory purposes. Laboratory grade (≥95%) is acceptable for qualitative work, while technical grade (≥90%) is used for industrial processes where high purity is not critical.