Question

What is meant by homogeneity of powdered sample? How will this affect percentage purity of KHP?

Answer 1

Homogeneity of Powdered Sample

If the Powdered sample are of same size, then the sample is accepted as Homogenous. When the Sample is prepared from the various components, the particle size must be in uniform size after mixing. It can be attained from outside effects The Sample may be obtained from the mixture of components of different physical conditions. For instance its colour, size or liquid content. Before, homogeneity of a sample is achieved by senses, in recent days it is quantitatively analysed with instruments and the category of the quantity.

Homogeneity affects the purity percentage of KHP(Potassium Hydrogen Phthalate)

KHP is a compound which has slight acidic character, produce colorless crystals, white powder, an ionic solid comprises of monopotassium salt of phthalic acid. While achieving the purity percentage of KHP the analysis gets speedy when the lighter sample is titrated first. But for homogeneity all the size of the sample must be in uniform size. There is possibility of residual unsoluble particles of KHP at the bottom of the Erlenmayer flask while titrating. Care should be taken while titrating whether all the KHP particles are complete dissolved before titration. In case of Homegoneity this difference in particle size is not allowed. While taking uniform size of KHP for titration the percentage of purity will get altered.