# chemistry

Write the balanced equation of the reaction described below. Include the states (s, l, aq, g) for the reactants and products.

When aqueous calcium chloride and sodium phosphate are mixed, solid calcium phosphate and acqueous sodium chloride are produced.

1. bobpursley

CaCl2 (aq) + Na3PO4 (s) >> Ca3(PO4)2 (s) + NaCl (aq)

Balancing it is easy. go to the most complicated formula, and wort from there.

it is Ca3(PO4)2

so you need three Ca on left then.

3 CaCl2 + Na3PO4 >> Ca3(PO4)2 + NaCl

Now consider the phosphates in the complicated calcium phosphate: two of them.

3CaCl2 + 2Na3PO4 >> Ca3(PO4)2 + NaCl
now clean it up. first, Cl
you need two Cl in NaCl...
3CaCl2 + 2Na3PO4 >> Ca3(PO4)2 + 2NaCl
done. reinsert the states from above.

but that's wrong because sodium is not balanced

3. bobpursley

Right. You need six NaCl. sometimes we introduce obvious errors to keep student from copying and pasting.
Good work.

but that's my problem I don't know how to get Na balanced

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