Text: Constituents of Sea Water Sea-water is 96.5 % pure water. The remaining 3.5 % consists of dissolved material of which some of the more abundant components are: Chlorine ion (55 %) Sodium ion (30.6 %) Sulphate ion (7.7 %) Magnesium ion (3.7 %) Potassium ion (1.1 %)

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