CHEMISTRY QUESTIOn?

Question

Write ionic and net ionic equations for the following reactions

2 K3PO4(aq) + 3 Sr(NO3)2(aq) --->


Mg(NO3)2(aq) + 2NaOH(aq) ----->

someone please help me with these two problems. I'm confused

science teachers answers are way off. they arent even balance

Answer 1

It would be unethical to do your homework for you, so I've provided this short lesson:

Chemistry really is easy; just don't be intimidated by the jargon:

Unless you've studied whether ion exchange will occur in solution, it's usually okay to assume the problem indicates ion exchange will occur. Ordinarily in high school, problems like this aren't designed to trick you.

An ionic equation is a chemical equation in which electrolytes are written as dissociated ions. Ionic equations are used for single and double displacement reactions which occur in aqueous solutions. For example in the following precipitation reaction:

CaCl2(aq) + 2AgNO3(aq) → Ca(NO3)2(aq) + 2AgCl(solid)

the full ionic equation would be:

(Ca++) + 2(Cl-) + 2(Ag+) + 2(NO3-) → (Ca++) + 2(NO3-) + 2AgCl(solid)

and the net ionic equation would be:

2(Cl-) + 2(Ag+) → 2AgCl(solid)

or in reduced balanced form

(Ag+) + (Cl-) → AgCl(solid).
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In your first example, the ions are (Sr++), (K+), (NO3-) and (PO4---). Will the strontium phosphate precipitate? Will the potassium nitrate precipitate?

In your second example, the ions are (Mg++), (Na+), (OH-) and (NO3-). Will the sodium nitrate precipitate? Will the magnesium hydroxide precipitate?

At the risk of oversimplification, if the reaction doesn't produce a precipitate, the ions remain in suspension and the "yields arrow" should point in both directions.

I went ahead and indicated the "electrical charges" of the respective ions. Don't forget to include that in your work; with respect to how you indicate the charges, for instance: "---" should be written in superscript as "3-" (but I can't do subscripts/superscripts in this forum).

Answer 2

I'm looking at this and remember when I took chemistry in college. You need to examine the lesson in your text book. I remember seeing the charges for each elements and based on the reaction certain properties applied.

What are you confused about?

Answer 3

2K3PO4 + 3 Sr(NO3)2 --->6KNO3 + Sr3(PO4)2

Mg(NO3)2 + 2NaOH ---> Mg(OH)2 +2 NaNO3