Because not all aqueous reactions form precipitates, one must consult the solubility rules before determining the state of the products and writing a net ionic equation. NAG (Nitrates, Acetates, Group 1 alkali metal ions) SAG (Sulfates, Ammonium ion, and Group 17 halide ions) Exceptions: PMS (Pb 2+, Mercury (I) ion, and Silver ions are insoluble when combined with sulfate and group 17 anions.) Castro Bear (Ca 2+, Sr 2+, and Ba 2+ are insoluble when combined with the sulfate anion. 'PMS' P -> Pb2+ (Lead) M -> Hg22+ (Mercury) S -> Ag+ (Silver) 2. NAG SAG: always soluble Nitrates (NO3-) Acetates (C2H3O2-) Group 1 Sulfates (SO4-2) Ammonium (NH4+) Group 17 PMS: Pb (lead), Mercury (Hg),Silver (Ag) -PMS never soluble with Sulfates or G17 CaStro Bear: Ca, Sr, Ba. Whether or not such a reaction occurs can be determined by using the solubility rules for common ionic solids. N itrates A cetates S ulfates A mmonium 1 (Group 1). Precipitation reactions occur when cations and anions in aqueous solution combine to form an insoluble ionic solid called a precipitate. We know AgCl is the solid since Ag is a exception to the soluble rules as seen in the PMS rules The precipitate formed is AgCl, as indicated by the subscript s We know NaNO3 is a solution because NO3 is a Nitrate which is almost always soluble according to the solubility rules. These subscripts indicate the phase of the compounds. The subscript aq means aqueous, which means it is a solution in a solvent. I wonder if dad will let me get a pet Kangaroo so I can finally have someone to wrestle with! He is always on the phone! What can be so important?įranks phone: "Hello! Thank you for calling selective hearing!"įranks phone: "Here, you can pretend you're on the phone to avoid your wife."įranks phone: "Because whatever she has to say probably involves money." When the two solutions, NaCl and AgNO3, are mixed, a precipitate, AgCl, is formed.įrank! Frank! Hello? Get off your phone for a minute! The periodic table is organized into rows and columns called periods and groups, respectively. Things to remember about double displacement 1.Recognize that salts containing Group 1A elements are soluble. This product is insoluble, or cannot be dissolved in water. _abc Powtoon Transcript Double DisplacementĪ double displacement reaction Is a type of chemical reaction where two compounds react, and the positive ions (cation) and the negative ions (anion) of the two reactants switch places, forming two new compounds or products.Ī precipitation reaction is when two compounds react and form a precipitate, which is a solid product.
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