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Sodium carbonate is formed when a sodium cation that has a charge of 1+ combines with a carbonate polyatomic ion that has a charge of 2-. Using the crisscross method, write the formula for sodium carbonate.

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The formula for sodium carbonate is Na2CO3.

The sodium cation has a charge of 1+ and the carbonate ion has a charge of 2-. To write the formula of sodium carbonate, we move the charge of the sodium cation to the subscript position of the carbonate ion and the charge of the carbonate ion to the subscript position of the sodium cation and get Na2CO3. Since the ion ratio in this formula cannot be reduced further, this is the formula for sodium carbonate.

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