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CEC_practice_problems - Cation exchange review and practice...

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Cation exchange review and practice problems Review: One mole of any substance (element, molecule, compound) is the atomic mass of the element, molecule or compound. The mass of one mole of hydrogen, for example, is 1 gram. The mass of one mole of calcium ions (Ca 2+ ) is 40 g and the mass of one mole of nitrate ions (NO 3 - ) is 62 grams (nitrogen = 14g plus 3 oxygen, each 16g). In many chemical applications, a mole is too big a unit to be easily manipulated. Instead of moles, centimoles (0.01 moles) or millimoles (0.001 moles) are used. The mass of a centimole of hydrogen is 0.01 grams and of a millimole is 0.001 g or 1 mg (milligram). Moles of charge are the same as moles of anything else. One mole of charge is the charge (positive or negative of one mole of an ion with either a +1 or -1 charge. A divalent ion such as calcium (Ca 2+ ) has 2 moles of charge for each mole of calcium atoms because it has two positive charges. A trivalent ion like aluminum has 3 moles of charge per mole of Al 3+ .
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