What is a main advantage of the gravimetric method?

The main advantage of the gravimetric method is precision. Gravimetric analysis is a highly accurate and reliable technique that involves the measurement of mass. This method relies on the formation of a stable, insoluble compound that can be isolated and weighed. The precision arises from several factors: the ability to produce high-purity precipitates, minimal interference from other substances in the sample, and the precise measurement of mass using calibrated balances.

In comparison, other options such as speed, cost-effectiveness, and selectivity do not position gravimetric methods as favorably. Gravimetric analysis often requires careful preparation of samples, extended reaction times, and thorough purification processes, which can slow down results. While the materials used may be less expensive than those in some analytical techniques, the overall process may not be as cost-effective when considering labor and time involved. Selectivity can also be a limiting factor; while gravimetric methods can be very specific, they are typically less versatile than other methods that can analyze mixed samples more readily. Overall, the combination of mass measurements with high fidelity makes gravimetric analysis a preferred choice when precision is of utmost importance.