4-identify-ionic-solutions

4-identify-ionic-solutions - CHM151LL: IDENTIFICATION OF...

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Identification of Ionic Solutions OBJECTIVES: This week’s laboratory assignment will help you: practice equation writing and balancing find properties of compounds in The CRC Handbook of Chemistry and Physics identify the products formed in a set of double replacement reactions, and use the identities of those products to identify the reactants. DISCUSSION: Be sure to complete the prelaboratory exercises before coming to lab. The CRC Handbook of Chemistry and Physics lists the physical properties of inorganic compounds in an extensive table. Organized alphabetically, the table gives the color and crystal form of solids, melting and boiling points, solubility, et cetera . Look up each of your predicted nonelectrolyte or weak electrolyte products, and record the properties that will help you identify them, such as the color and expected appearance of each precipitate. These product predictions will guide your later reasoning, leading to the correct identification of the unknown ionic solutions. Do not assume that the order of the reactions on the prelaboratory assignment indicates the actual order of your solution bottles. CAUTIONS: Use deionized water from a wash bottle for the final rinse because tap water will contaminate your glassware with dissolved minerals and confound your results. Remember to wash your hands and arms thoroughly as you leave the lab today. Wipe up any spilled chemicals with a wet paper towel and discard it in the wastebasket. Rinse your spot plate over the waste bottle, not into the sinks. Table 1. Solubility of some ionic compounds in water I. Always soluble: A. Compounds containing ammonium (NH 4 + ) or any Group 1 (IA) cation. B. Compounds containing nitrate (NO 3 ) or acetate (CH 3 COO ) anions. II. Soluble with few exceptions: A. Compounds containing chloride, bromide, or iodide (Cl , Br , I ) ions. Insoluble if combined with silver, lead(II), or mercury(I) (Ag + , Pb 2+ , Hg 2 2+ ) ions. B. Compounds containing sulfate (SO 4 2– ). Insoluble with barium or lead(II) (Ba 2+ , Pb 2+ ). III. Insoluble (unless covered by rule I.A.) Compounds containing hydroxide, carbonate, arsenate, phosphate, sulfide, oxide, chromate or dichromate (OH , *CO 3 2– , AsO 4 3– , PO 4 3– , S 2– , O 2– , CrO 4 2– , Cr 2 O 7 2– ) ions. *Carbonic acid, once formed in aqueous solution, rapidly decomposes into water and
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4-identify-ionic-solutions - CHM151LL: IDENTIFICATION OF...

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