On adding aluminium sulphate solution to calcium chloride solution, a precipitate of calcium sulphate is formed.Cobalt(II) chloride reacts with sodium carbonate to form pink/red coloured precipitate of cobalt(II) carbonate and sodium chloride.On adding a solution of lead nitrate to sodium iodide solution, a yellow precipitate of lead iodide is formed.On passing hydrogen sulphide gas through copper sulphate solution, a black precipitate of copper sulphide is formed.On mixing an aqueous solution of lead nitrate with sodium sulphate, a white precipitate of lead sulphate is formed.On mixing an aqueous solution of barium chloride with that of copper sulphate, a white precipitate of barium sulphate is formed.On mixing aqueous solutions of silver nitrate and sodium chloride, a white curdy precipitate of silver chloride is formed.On mixing an aqueous solution of hydrochloric acid with an aqueous solution of sodium hydroxide, sodium chloride and water are formed.Gases such as HCl and NH 3 are soluble in water, but some other gases, such as H 2S, are not soluble in water. This process usually takes place when the concentration of dissolved ions in the solution exceeds the solubility product.Ī double displacement reaction should also occur if an insoluble gas is formed. Precipitation is the formation of a solid in a solution or inside another solid during a chemical reaction. The acid base reaction results in the formation of salt (neutral in nature) and water. An acid-base reaction occurs, when an acid reacts with equal quantity of base. Neutralization reactions are a specific kind of double displacement reaction. This results in the formation of product molecule.ĭouble displacement reactions can be further classified as neutralization, precipitation and gas formation reactions. The reactants changes into ions when dissolved in water and there is an exchange of ions in solution. The general equation which represents a double displacement reaction can be written as:ĭouble displacement reactions generally take place in aqueous solutions in which the ions precipitate and there is an exchange of ions.įor example, on mixing a solution of barium chloride with sodium sulphate, a white precipitate of barium sulphate is immediately formed. During this reaction, the cations and anions of two different compounds switch places, forming two entirely different compounds. The Theoryĭouble displacement reactions may be defined as the chemical reactions in which one component each of both the reacting molecules is exchanged to form the products. To perform a double displacement reaction using sodium sulphate and barium chloride solutions.
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