Writing Balanced Chemical Equations of Reaction:
Chemical reactions occur between chemical elements or compounds, called reactants, to form different elements or compounds, called products. Chemists resort to chemical equations to convey this information concisely.
A correctly written chemical equation conveys information on the state of matter (liquid, gas, solid precipitate, aqueous solution, etc) of each reagent, as well as the amount of each. All charges and quantities of each element must be balanced correctly.
Simplifying :
We are required to write the balanced chemical equation for the reaction between nitrogen dioxide (NO₂) and water (H₂O). We are told that nitric acid (HNO₃) and nitrogen monoxide (NO) are formed.
Let's begin by writing out the reaction, together with the states of each reactant:
NO₂(g) +H₂O(l) →HNO(aq)+ NO(g).
Unfortunately, this equation is not balanced. There are 2 'atoms' of hydrogen on the left hand side, and only one on the right hand side. Thus, let's introduce a coefficient of 2 on the nitric acid:
NO₂(g) +H₂O(l) → 2HNO₃(aq) +NO(g).
It is still not balanced: there are three 'atoms' of nitrogen on the right hand side, and only one on the left hand side. Let's introduce a coefficient of 3 on the nitrogen dioxide:
3NO₂(g) +H₂O(l) → 2HNO₃(aq) +NO(g).
Finally, all atoms are balanced. This is the complete balanced equation for the given reaction. All states of matter are also included.
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