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25 September, 07:44

How to find the formula for sodium phosphate?

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  1. 25 September, 11:44
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    PO4 anion has a 3 - charge. A sodium cation, has a 1 + charge. Now, you have to think how many Na ions you need to fully neutralize the PO4 's 3 - charge. Answer 3. That's because a molecule must have a neutral charge (a 0 charge). 3 + (-3) = 0. So, sodium phosphate has the formula Na3PO4.
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