This discussion focuses on minimizing errors in gravimetric analysis, specifically when using Barium Sulfate (BaSO4) as a precipitate. Key issues identified include the presence of impurities that increase the weight of the precipitate and the low solubility of BaSO4, which can lead to incomplete dissolution during washing. The concept of coprecipitation is highlighted as a significant factor affecting the purity of the precipitate. Additionally, the methodology of sampling from different sections of a non-homogeneous fertilizer sample is proposed as a potential solution to achieve more accurate results.
PREREQUISITESChemistry students, laboratory technicians, and researchers involved in analytical chemistry and gravimetric analysis, particularly those working with precipitates and sample purity issues.
man0005 said:-precipitate not being pure e.g. other ions (present in the precipitate increasing the weight of the precipitate)
in an experiment where BaSO4 is used and some of it isn't dissolved in the wash due to the 'low solubility' of BaSO4 - resulting in a lower weight, decreasing the percentage by mass of the precipitate.
impurities in the sample