after identifying the precipitate - next step is to write a chemical. a) The balanced formula equation for the reaction of aqueous AgNO 3 with NaCl is written as: AgNO 3 (aq) + NaCl(aq) AgCl(s) + NaNO 3 (aq) Note that in the above equation, the physical state of the AgCl product is denoted by the letter s, to indicate that it is the precipitate. (You cannot swap both you would end up with the same substances you started with.) Either perspective should allow you to predict the proper products, as long as you pair a cation with an anion and not a cation with a cation or an anion with an anion. Writing Equations for Precipitation Reactions. 1 In the following section, we will examine the reaction that occurs when a solid piece of elemental magnesium in placed in an aqueous solution of copper (II) chloride: (8.5. There are two equivalent ways of considering a double-replacement equation: either the cations are swapped, or the anions are swapped. Precipitate is what falls out of a super saturated solution or what remains after a super-saturated solution evaporates. Many reactions of this type involve the exchange of ions between ionic compounds in aqueous solution and are sometimes referred to as double displacement. It might be helpful to look at a few more examples.
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