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What is the ratio of magnesium ions and chloride ions in a magnesium chloride solution?

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padgettcecilia | Student, Grade 11 | eNotes Newbie

Posted May 5, 2013 at 6:31 PM via web

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What is the ratio of magnesium ions and chloride ions in a magnesium chloride solution?

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tjbrewer | Elementary School Teacher | (Level 2) Associate Educator

Posted May 5, 2013 at 11:00 PM (Answer #1)

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The Ratio of Magnesium to Chloride is 1:2.  Magnesium is an alkali Earth Metal, it naturally forms ions with a +2 charge. 

Chlorine is a halogen gas it naturally forms ions with a -1 charge.  This means that two Chloride ions must be present to balance the charge of the Magnesium ions. 

Another way to look at it is by valence electrons.  Magnesium has two valence electrons and isn't strongly attached to them, so gives them freely.  Chlorine has 7 electrons, and strongly attracts others, but it only has room for one more, so you need two Chlorine atoms to take Magnesium's electrons. 

Either way you get a ratio of 1 Magnesium ion to 2 Chloride ions. 

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