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109week5solved - Chemistry 109 Types of Reactions and...

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Chemistry 109 Types of Reactions and Solubility Lyric of the Week: “Stand up and let’s start showing just where our lives are going to” – Land of Confusion – Disturbed or Genesis Precipitation Reactions 1. Cations and Anions in aqueous solution are combined to form neutral insoluble solids. 2. Combining a. Remember when dealing with charged species, usually opposite charges attract b. Use the crisscross rule to determine how much of each ion is present. c. The compound that is formed is either soluble in water or it is insoluble and forms a precipitant. 3. Rules of solubility a. A compound is probably soluble if it contains one of the following cations: i. Group 1A cations: Li + , Na + , K + , Rb + , Cs + ii. Ammonium ion: NH 4 + b. A compounds is probably soluble if it contains one of the following anions: i. Halide: Cl - , Br - , I - , except Ag + , and Hg 2 2+ and Pb 2+ compounds ii. Nitrate (NO 3 - ), perchlorate (ClO 4 - ), acetate (CH 3 CO 2 - ), sulfate (SO 4 2- ), except Ba 2+ , Hg 2 2+ , and Pb 2+ sulfates c. A compound that does not contain one of the ions listed above is probably not soluble. 4. Net Ionic Equations a. Up to now, all the chemical equations have been written as molecular equations, shows all compounds in their molecular form. b. In reality, the compounds that qualify as electrolytes disassociate into their separate cations and anions when placed into water. c. Writing a ionic equation allows the cations and anions to be shown Molecular equation: Pb(NO 3 ) 2 (aq) + 2KI (aq) 2KNO 3 (aq) + PbI 2 (s) Ionic Equation: Pb 2+ (aq) + 2NO 3 (aq) +2K + (aq) +2I - (aq) 2K + (aq) + 2NO 3 - (aq) + PbI 2 (s) d. Ions that appear on both sides of the equation are spectator ions and can be
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109week5solved - Chemistry 109 Types of Reactions and...

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