3/4/2023 0 Comments Precipitate rules![]() A precipitation reaction occurs when two ionic compounds are dissolved in water and form a new ionic compound that does not dissolve this new compound falls out of solution as a solid precipitate. However, there is one type of double-replacement reaction that we can predict: the precipitation reaction. Predicting whether a double-replacement reaction occurs is somewhat more difficult than predicting a single-replacement reaction. Predict the products of this double-replacement equation: KBr + AgNO 3 → ? Answer Thinking about the reaction as either switching the cations or switching the anions, we would expect the products to be BaSO 4 and NaCl. Predict the products of this double-replacement equation: BaCl 2 + Na 2SO 4 → ? Solution (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. There are two equivalent ways of considering a double-replacement equation: either the cations are swapped, or the anions are swapped. A characteristic of a double-replacement equation is that there are two compounds as reactants and two different compounds as products. Use the activity series to predict the products, if any, of this equation.Ī double-replacement reaction occurs when parts of two ionic compounds are exchanged, making two new compounds. As such, it will not replace hydrogen in a compound with the nitrate ion.
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