Homework Help

Which metal shows the greater tendency to form a positive ion? Magnesium+Copper(II)...

user profile pic

user3120320 | (Level 1) Salutatorian

Posted March 23, 2013 at 10:11 PM via iOS

dislike 1 like

Which metal shows the greater tendency to form a positive ion? Magnesium+Copper(II) sulfate---> magnesium sulfate+Copper

1 Answer | Add Yours

user profile pic

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

Posted March 23, 2013 at 10:35 PM (Answer #1)

dislike 1 like

In your Chemical equation, Magnesium is added to a Copper(II) Sulfate solution.  A displacement reaction occurs.  The Copper becomes a solid precipitate and Magnesium replaces it in the solution. 

In solution, the ionic compound Copper(II) sulfate separates into Copper cations (positive ions) and Sulfate anions (negative ions).  They are held apart by the reorientation of the solvent's (usually water) adjacent molecules.  Then when the Magnesium is added.  The Magnesium atoms give up their valence electrons to the Copper cations,indicating that Magnesium has the greater tendency to form positive ions (cations). 

Join to answer this question

Join a community of thousands of dedicated teachers and students.

Join eNotes