Meehan98
  • Meehan98
What is the net ionic equation that occurs when zinc nitrate and lithium phosphate are mixed together in water? A precipitate of zinc phosphate is formed. I understand how to get the net ionic equation, but the first step of writing the equation is what's confusing me.
Chemistry
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SOLVED
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katieb
  • katieb
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Meehan98
  • Meehan98
The equation that I have right now is: \[Zn NO _{3} + Li PO _{4}\rightarrow Zn PO _{4}\] How do I balance this equation when Lithium and Nitrate aren't on the products side of the equation?
aaronq
  • aaronq
But they are present, they're just not a precipitate. \(\sf Zn(NO_3)_2+Li_3PO_4\rightarrow Zn_3(PO_4)_2+LiNO_3\) When you write these equations, make sure you write a label for it's state in solution, (aq), (s), (g) etc.
Meehan98
  • Meehan98
Do you mind explaining to me the changes you made to the equation? I don't know why I'm having so much trouble with this..

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aaronq
  • aaronq
You need to know the charges of polyatomic ions and balance these appropriately - focus on that and this will be easy
aaronq
  • aaronq
For example, the charge on \(PO_4^{-3}\) is 3- and for \(Li^+\) is just 1+ so to balance the charges you need 3 \(Li^+\) and one \(PO_4^{-3}\) so you get \(Li_3PO_4\)
Meehan98
  • Meehan98
OK, so for \[Zn ^{2+} PO _{4}^{3-}\] you find the least common multiple of the two charges and are left with \[Zn _{3} (PO _{4}) _{2}\] Thank you! You've been the greatest help!

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