107. Solving a chemistry problem
To prepare a reference solution of calcium ion, 0.749 g of calcium carbonate is shaken with 10 ml of water in a 100 ml volumetric flask, hydrochloric acid is added until dissolved, and then adjusted to the mark with water (solution A). Transfer 10 ml of solution A into a 1-liter volumetric flask and dilute to the mark with water (solution B). Calculate the content of calcium ion in mg in 1 ml of solution B
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