P i 0974 or 974 Ideally you would like to calculate this number using 1 solute multiplet in the spectrum and perhaps take the average concentration value for these to achieve a better representation of the analyte purity. Formula for percentage purity percentage purity mass of pure substance mass of impure sample 100 To find the mass of pure substance we can react a sample and leave the impurities behind. From some reactions the percentage yield is given.
But we need to calculate the amount of impure substance in an equation for example.
Percentage purity Percentage purity of a substance can be calculated by dividing the mass of the pure chemical by the total mass of the sample and then multiplying this number by 100. Percentage yield frac actual yield theoretical yield times 100 The percentage yield can vary from 100 no product has. In an experiment to displace copper from copper sulfate 65 g of Zinc was added to an excess of copper II sulfate solution. Percentage Yield Yield Obtained Theoretical Yield x 100.