Question #e047b
1 Answer
You write soluble ionic compounds as cation and anion.
In your case, barium nitrate,
Ba_((aq))^(2+) + 2NO_(3(aq))""^(-)
The 2 stoichiometric coefficient comes from the fact that you need two nitrate anions to balance the charge of the barium cation.
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So, always try to identify the cation and anion first, and figure out the stoichiometric coefficients by looking at the charges.
Keep in mind that ionic compounds follow the cross-over rule. Here's an example of how that works with calcium nitrate, which is very similar to barium nitrate in terms of cation and anion charges
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