Gravimetric Analysis is quite accurate and precise but primarily for which amount?

Gravimetric analysis is notably effective for macro amounts of substances primarily due to the inherent characteristics of the method. In gravimetric analysis, the substance of interest is converted into a solid, and then its mass is measured. This process typically involves a series of steps, including precipitation, filtration, drying, and weighing, which are more manageable and reliable when dealing with larger quantities of material.

When analyzing macro amounts, the relative errors associated with weighing become less significant due to the larger mass being measured. For example, if you weigh a 1-gram sample, a 0.001-gram error represents only 0.1% of the total mass, which is generally acceptable in analytical work. In contrast, as the amount reduces to the micro or nano scale, the precision of weighing instruments may not suffice due to the increased relative error, handling difficulties, and the potential for contamination.

Therefore, gravimetric analysis is particularly well-suited for macro amounts, where it can achieve higher accuracy and precision, making it a preferred method in many analytical settings involving larger sample sizes.