Hydrochloric acid double displacement reactions

When acids and bases come into contact with one another, a chemical reaction called a neutralization reaction takes place. A neutralization reaction is a double displacement reaction. In a double displacement reaction, the positive ions from one reactant take the place of the positive ions in the other reactant. For example, if hydrochloric acid and sodium hydroxide react with one another, the positive sodium ion in sodium hydroxide will take the place of the hydrogen ion in the hydrochloric acid ... 

Fe is the chemical symbol for iron. It comes from iron s Latin name, Ferrum. In this reaction, the iron in iron oxide (Fe2Os) switches places with the hydrogen in the hydrochloric acid (HCl). Double displacement reactions are like two pairs of dancers switching partners. 

The reaction of hydrochloric acid and sodium carbonate, Na2C03 (washing soda), is a double displacement reaction. This reaction initially forms sodium chloride and carbonic acid, H2CO3. The carbonic acid spontaneously decomposes to water and carbon dioxide gas. 

Consider the reaction of aqueous sodium carbonate (washing soda) and hydrochloric acid, shown in Figure 4.17. Hydrochloric acid is sold at the hardware store under the common name muriatic acid. If you carry out this reaction, you immediately see the formation of carbon dioxide gas. The first reaction that takes place is a double displacement reaction. Determine the products in the following way. Separate the reactions into ions, and switch the anions. Write chemical formulas for the products and balance the equation. 

You can easily identify limestone and marble by their reaction with hydrochloric acid. The gas that is produced by this double displacement reaction is carbon dioxide. 

In some double-displacement reactions, one of the products is an insoluble gas that bubbles out of the mixture. For example, iron(II) sulfide reacts with hydrochloric acid to form hydrogen sulfide gas and iron(II) chloride. 

In some double-displacement reactions, a very stable molecular compound, such as water, is one of the products. For example, hydrochloric acid reacts with an aqueous solution of sodium hydroxide to yield aqueous sodium chloride and water. 

---