Gravimetric analysis is a technique wherein the amount of an analyte can be determined through the measurement of mass. Gravimetric analysis depends on comparing the masses of two compounds containing the analyte. It involves isolation of an ion in a solution by a precipitation reaction, filtering, washing the precipitate free of contaminants, conversion of the precipitate to a product of known composition, then weighing the precipitate, and determining the difference in mass. From the mass and known composition of the precipitate, the amount of the original ion can be determined.
Volumetric analysis also known as titrimetric analysis is an analytical technique that involves measurement of volume from a solution with known concentration which is used to determine the concentration of the analyte.
Colorimetric analysis is an analytical technique that uses color changes in comparing solutions to determine the concentration of analyte. It utilizes a special type of spectrometer known as UV Vis spectrophotometer. It is used to measure the intensity of light by absorption or transmission which is proportional to the concentration of the colored solution.