What does Ca^(2+) + Na2CO3 create?

What does Ba^(2+) + Na2CO3 create?
What does Ba^(2+) + Na2CrO4 create?

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CaCO3

BaCO3
BaCrO4
See this list of solubilities. You should learn this chart.
http://www.files.chem.vt.edu/RVGS/ACT/notes/solubility_rules.html

To determine the products of a chemical reaction, we need to consider the charges and valences of the ions involved.

1. Ca^(2+) + Na2CO3 → CaCO3 + 2Na+

In this reaction, the Ca^(2+) ion from calcium (Ca) combines with the CO3^2- ion from sodium carbonate (Na2CO3) to form calcium carbonate (CaCO3), while the remaining sodium (Na) ion (Na+) stays as a spectator ion and does not participate in the reaction.

2. Ba^(2+) + Na2CO3 → BaCO3 + 2Na+

Similarly, in this reaction, the Ba^(2+) ion from barium (Ba) reacts with the CO3^2- ion from sodium carbonate (Na2CO3) to produce barium carbonate (BaCO3), and the sodium (Na) ion (Na+) remains unchanged.

3. Ba^(2+) + Na2CrO4 → BaCrO4 + 2Na+

In this reaction, the Ba^(2+) ion from barium (Ba) reacts with the CrO4^2- ion from sodium chromate (Na2CrO4) to form barium chromate (BaCrO4), while the sodium (Na) ion (Na+) remains as a spectator ion.

In summary:
1. Ca^(2+) + Na2CO3 → CaCO3 + 2Na+
2. Ba^(2+) + Na2CO3 → BaCO3 + 2Na+
3. Ba^(2+) + Na2CrO4 → BaCrO4 + 2Na+