Magnesium ions can be precipitated from seawater by, Ask an Expert

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Magnesium ions can be precipitated from seawater by theaddition of sodium hydroxide.
How much sodium hydroxide in grams must be added to a sampleof seawater to completely precipitate the 83.2 mg of magnesiumions present? (Hint: Begin by writing a balanced equation for thereaction between magnesium ions and sodium hydroxide.)

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