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Potassium nitrate, carbon dioxide and water. Looking at the last two reactants, we can take a fairly good guess that this could be a carbonate-acid reaction. Let's try it.

We need potassium (ions) somewhere (either in the carbonate or the acid) and nitrate ions in the other. Since all acids must have an H+, the potassium (positive ion) cannot be in the acid. So we must have nitrate in the acid: HNO3, which is just nitric acid. Now the potassium must be in the carbonate, so we balance the ionic formula: K+ and CO32-, and we get K2CO3.

So the two reactants are HNO3 and K2CO3, and the equation is

HNO3 + K2CO3 --> KNO3 + CO2 + H2O

Hope this helped :)

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