This rule is used to predict whether a precipitate will form or not. The fundamental rule that a double-replacement reaction follows is the solubility rule. (NH 4) 2SO 4 (aq) + Ba(NO 3) 2 (aq) → 2 NH 4NO 3 (aq) + BaSO 4 (s/ppt.) Double-replacement Reaction Rules How to Predict a Double-replacement Reaction? So, we multiply the compound NH 4NO 3 by 2 to balance the equation. However, we find that there are only one NH 4 – and one NO 3 – on the right-hand side and two of each ion on the left. We note that the anions SO 4 2- and NO 3 – interchange their places to form the products. The products are barium sulfate (BaSO 4) and ammonium nitrate (NH 4NO 3). The products are sodium bromide (NaBr) and iron (III) hydroxide (Fe(OH) 3) precipitate.įeBr 3 (aq) + 3 NaOH (aq) → Fe(OH) 3 (s/ppt.) + 3 NaBr (aq.)ĭouble Replacement Reaction Examples How to Balance a Double-replacement Reaction?Ĭonsider the reaction between ammonium sulfate ((NH 4) 2SO 4) and barium nitrate (Ba(NO 3) 2). Examples of Double-replacement ReactionĪn example of a double-displacement reaction is the reaction between iron (III) bromide (FeBr 3) and sodium hydroxide (NaOH). Another clue, if the states of matter are cited, is to look for aqueous reactants and the formation of one solid product since the reaction typically generates a precipitate. The easiest way to identify a double displacement reaction is to check to see whether or not the cations exchanged anions with each other. How to Identify a Double-replacement Reaction? The two compounds are in their aqueous solutions react to form an insoluble precipitate, an insoluble gas, or water. What Happens in a Double-replacement Reaction?Ī double-replacement reaction exchanges the cations or anions of two ionic compounds. The reaction results in two new products, which are also ionic compounds. The positive ions (cation) and negative ions (anion) of the two reactants, which are ionic compounds, exchange their places. The general formula of double-replacement reaction is:ĭouble Replacement Reaction Why does Double-replacement Reaction Occur?Ī double-replacement reaction occurs when two ionic compounds react. The bonds formed in the product compounds are the same type of bonds, as seen in the reactant molecules. Ionic compounds mostly participate in a double-replacement reaction, so do acids and bases. ![]() Double-replacement reaction takes place in an aqueous solution and typically results in the formation of a precipitate. Double-replacement Reaction Examples in Real LifeĪ double-replacement reaction, also known as a double displacement reaction, is a type of chemical reaction in which two reactants exchange ions to form two new compounds.How to Balance a Double-replacement Reaction?.Examples of Double-replacement Reaction.How to Identify a Double-replacement Reaction?.What Happens in a Double-replacement Reaction?.Why does Double-replacement Reaction Occur?.
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