Pharmacy Study Material

Free pharmacy material Gravimetry INTRODUCTION Theodore W. Richard first proposed the technique of gravimetric analysis for the determination of chlorine and silver ions. This method is a quantitative analytical method which is done by a process of precipitation, isolation and weighing of the isolated product. It is mainly based on the measurement of the analyte. PRINCIPLE The principle involved in this method is that the sample is dissolved in a solvent and then the precipitating agent is added. The resulting precipitate is filtered dried and weighed. The separation of the sample is carried out by the following principle methods: Precipitation method: In this method the sample is completely precipitated. Volatilization method: In this method the sample is completely volatilized. Electro-analytical methods: In this method the sample deposited on an electrode. Extraction and chromatographic methods: Here, the sample is separated from the matrix after precipita...