Edta solution with concentration 0.002 l/molePicasso, for example, water volume pet 10.00 cm 3 capacity do reactions fit 15.00 cm.The metal ion in the water, there are examples where the reaction with edta in proportion 1: 1mol.Aqueous solution of edta edta is 1000 cm volume = 0.002 moles mole.Edta solution thaitharet is the volume number of cm 15.00 MOL = 0.002 * 15.00 1000 Division mole.The number of MOL MOL = ca edta 3 * number * 10.Therefore, in aqueous solution, for example 10.00 cm number of MOL ca = 3 * 10.Water softener needs to report, for example, to compare all the volume is 1 L.Sample volume 10.00 cm number of MOL ca = 3 * 10mole.If the substance, for example, has a volume of 1000 cm 3 is the number of moles = ca * 10 * 1000mole = 3 * 10mole.The weight of the caco 3 = * 10moleSubstances, for example, are all hard mgcaco 300 300 ppm in the 1 L volume.Considered a medium hard
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