Question

Write the complete balanced equation for the reaction that occurs when barium chlorate (Ba(CIO3)2) reacts with sodium phosphate (Na3PO4) in an aqueous solution

Answer 1

3 Ba(ClO3)2(aq) + 2 Na3PO4(aq) --> Ba3(PO4)2(s) + 6 NaClO3(aq)

The product Ba3(PO4)2 is an insoluble solid in water.
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Answer 2

Step-by-step explanation:

To balance any chemical equation it is necessary to follow a few steps. You can see the attachment while reading for better understanding (valence of each element are shown in orange color).

1st) Find the valence of each element in the molecule:

Look for the valence of each element in the periodic table. Some elements has more that one valence but to take the correct one remember that the charge of whole molecule has to be cero (in this example). It is necessary multliply the valence of an element by the subscript that affects it.

For example, in barium chlorate molecule:

• Barium atom has a positive valence equal 2, and there is just one of this atom, so its final valence in the molecule is +2.
• Chlorine atom has a positive valence equal 5, and in the whole molecule there are two chlorine atoms, so the final valence is +10.
• Oxygen atom has a negative valence equal 2. In this case there are three atoms of oxygen in two chlorates so the total valence for oxygen is -12.

Adding these final valances we can check that the whole molecule has zero charge.

Then, do the same process with the molecule of sodium phosphate.

2nd) Write the products with the correct subscript:

To write the correct products it is necessary to combine the positive part of the one molecule with the negative part of the other molecule (you can see this with color in the attachment).

For example: barium atom has a positive total valence in the molecule of barium chlorate and phosphate has a negative total valence in the sodium phosphate molecule. Doing this, the final product of this combination is barium phosphate.

Do the same to obtein the sodium chlorate molecule. In this case it is important to know that the chlorate stays the same in the sodium chlorate than in the barium chlorate, so you have to make that molecule with one chlorine and its three oxygens. You can't change the number of oxygens because they came from the original barium chlorate molecule.

Once you combine the parts of the molecules, you have to write the correct subscripts for each product in order to make zero the charge of molecules, like in the first step.

3rd) Balance the equation:

Now we are ready to balance the equation. To do this we need to secure that there are the same amount of elements in each side of the equation, the left side of the arrow (reactants) and the right side of the arrow (products), this is the "Law of conservation of mass". So it is necessary to write a coefficient (blue in the attachment) in front of the molecule we need to balance.

We realize that the equation is balanced when we have 3 barium atoms, 6 chlorine atoms, 6 sodium atoms, 2 phosphorus atoms and 26 oxygen atoms.