12 Test Tube Mystery C12-1-07

12 Test Tube Mystery C12-1-07 - Aqueous Solutions The 12...

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Introduction: Water is one of the most under-appreciated substances on earth…. Almost two thirds of our planet is covered by water, and water is the most abundant substance in our bodies. Because water is so common, we tend to take its unique chemical and physical properties for granted. In fact, water possesses many unusual properties essential to support life on Earth. One of the most important properties of water is its ability to dissolve a wide variety of substances. The water in nature, therefore, likely contains a variety of dissolved substances. Solutions in which water is the dissolving medium are called aqueous solutions . Many of the chemical reactions that take place within us and around us involve substances dissolved in water. Nutrients dissolved in blood are carried to our cells, where they enter into reactions that help keep us alive. Automobile parts rust when they come into frequent contact with aqueous solutions that contain various dissolved substances. Spectacular limestone caves are formed by the dissolving action of underground water containing carbon dioxide. There are three basic types of aqueous reactions: Precipitation Reactions - In a precipitation reaction, negatively-charged ions (called anions) and positively-charged ions (called cations) present in the solution combine to form a solid precipitate. For example, combining silver nitrate (AgNO 3 ) and ordinary table salt (NaCl) in water will form an aqueous solution that encourages both compounds to dissolve. The resulting anions (Cl - ) and cations (Ag + ) will tend to precipitate together forming silver chloride (AgCl). The net-ionic equation shows the actual reaction that is occurring molecularly and can be obtained as follows: Aqueous Solutions: The 12 Test Tube Mystery C12-1-07
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