2. A. What is surface codeposition? What is it due to? Which precipitates - coarse-crystalline, fine-crystalline or amorphous - adsorb dissolved substances better?
B. Describe the sequence of gravimetric determination of calcium in calcium carbonate. Calculate the optimal mass of calcium carbonate sample and the volume of 0.1 N oxalic acid solution required for analysis. Under what conditions should precipitation be carried out and why?

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