Gravimetric analysis is a technique through which the amount of the ion being analyzed can be determined through the measurement of mass. Gravimetric analysis depend on comparing the masses of two compounds containing the ion to be analyzed.
We’re going to work through a standard question to really understand how this works. What this question is really saying is that if you know the mass of something (an ion) in a pure substance, you can figure out the mass percent of that same ion in an impure sample if you know the mass of the impure sample. This only works for ions that can be completely precipitated and easily filtered, like the limestone in the video, or by using silver chloride to determine the % Cl-.
Here’s an example:
A 3.46 g sample of limestone(CaCO3 ) was dissolved in 0.1M (HCl) solution like this:
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