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). 1 ml of solution A is transferred into a 100 ml volumetric flask and diluted 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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