the equation will show nitric acid plus sulfuric acid yielding hydronium, nitronium, and deprotonated sulfuric acid. Then bromobenzene reacts w/ nitronium via electrohilic aromatic substitution.
to reiterate Le Chatlier as explained already-- a normal reaction will reach an equilibrium in which no more product is formed and no more reactants converted without addition of more reactant or removal of product. Howevere precipitation removes said product from solution allowing more product to be formed and pushin the reaction to the right (from reactant to product).
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