Calculate the weight of calcium carbonate required to prepare the reference solution A for calcium ions (100 ml) if the concentration of the reference solution B is 0.03 mg in 1 ml. Solution B is prepared by diluting 10.0 ml of solution A to 1 liter. Mm. calcium carbonate = 100.09 g/mol, the proportion of calcium ions in calcium carbonate is 40.08%.

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