In a double replacement reaction, the cations and anions of the reactants switch places to form new products. In this case, the reactants are sodium chloride NaCl and silver nitrate AgNO3 . The cations are Na+ and Ag+, while the anions are Cl- and NO3-. When the cations and anions switch places, the new products formed are sodium nitrate NaNO3 and silver chloride AgCl . The balanced chemical equation for this reaction is:NaCl aq + AgNO3 aq NaNO3 aq + AgCl s