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    How do you test for sodium ions in water? i can't seem to find the answer anywhere.

    The reason you can't find this anywhere is because there isn't really a test for Na+ like there is for Cl- or (SO4)2-. This is because Na+ salts are so soluble in water they rarely form precipitates. The best way to identify Na+ is with a flame test. Dip something such as a nichrome wire into the solution and then hold over the flame and observe the yellow flame.
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