Sulfuric acid double displacement reactions

Remember that an acid-base reaction is a double displacement reaction. Therefore, if sulfuric acid and potassium hydroxide are mixed, the positive ions trade places. The hydrogen ions from the sulfuric acid will react with the negative hydroxide ions to form water. Because a hydrogen ion has a charge of + 1 and a hydroxide ion has a charge of -1, they bond in a 1 1 ratio ... 

In the double displacement reaction above, dissolved sodium cyanide (NaCN) and sulfuric acid (H2S04) react to form sodium sulfate (Na2S04) and an extremely poisonous gas called hydrogen cyanide (HCN). The (aq) means these substances are an aqueous solution. An aqueous solution is made by dissolving chemicals in water. In this reaction, the sodium cyanide, sulfuric acid, and sodium sulfate are all dissolved in water. The (g) that follows the formula for hydrogen cyanide indicates that this chemical is a gas. The hydrogen cyanide will bubble out of the solution, leaving behind the sodium sulfate that is still dissolved in the water. 

Hydrogen fluoride, HF, is a highly toxic gas. It is produced by the double displacement reaction of calcium fluoride, CaF2, with concentrated sulfuric acid, H2S04. 

The other type of double-displacement reaction is the reaction between an acid and a base. This double isplacement reaction, called a neutralization reaction, forms water. Take a look at the mbdng solutions of sulfuric acid (auto battery acid, H2SO4) and sodium hydroxide (lye, NaOH). Here are the molecular, ionic, and net-ionic equations for this reaction ... 

Sulfuric acid will undergo many double-displacement reactions to produce new substances that may be hazardous. These substances should therefore be stored at distant locations. 

The subscript after potassium in the chemical formula for potassium sulfate shows that two potassium ions are needed. Potassium sulfate is a salt. When the two equations are put together (as they would occur when the acid and base are mixed together), they represent the double displacement neutralization reaction that occurs between sulfuric acid and potassium hydroxide ... 

Substitution or replacement reactions occur when a component of a chemical compound is replaced by something else. For example, zinc displaces hydrogen in Reaction 5.4.1. A double replacement or metathesis reaction occurs when there is a two-way exchange of ions between compounds. This happens, for example, when a solution of sulfuric acid reacts with a solution of barium hydroxide to yield solid barium sulfate and water ... 

In the environment. More generally, the results imply that a major chemical pathway for the Incorporation of sulfur into organic geopolymers is by reaction of HS with reactive sites, e.g. oleflnlc double bonds, displaceable halogens (39). within sedimentary organic matter. The Michael addition reaction of HS to acrylic acid may be used as a model case of such interactions. 

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