Reagents are added in a specified order to a large beaker containing an aqueous solution of nickel sulfate. Complex ions of nickel (II) are prepared by using aqueous solutions of ammonia, ethylenediamine, dimethylglyoxime, and cyanide ion.As each complex ion is formed its color and solubility are observed. Two alternate procedures may be used. MaterialsProcedure A 1000-ml beaker magnetic stirrer with stirring bar 300 ml distilled water 20 ml lMNiS04 40 ml 5M NH3 20 ml 25% ethylenediamine 25 ml 1% dimethylglyoxime 200 ml 1 M KCN Alternate Procedure B 7 600-ml beakers 6 glass stirring rods 2100 ml distilled water 140 ml 1 M NiS04 40 ml 5 M NH3 30 ml 25% ethylenediamine 25 ml 1% dimethylglyoxime 80 ml 1 M KCN Alternate Procedure C 2-1 beaker, preferably with approximate graduations 4 1-1 beakers, preferably with approximate graduations 4 glass stirring rods

Reagents are added in a specified order to a large beaker containing an aqueous solution of sodium carbonate. Ag2C03, Ag20.H20 or AgOH, AgCl, Ag(NH3)2+, AgBr, Ag(S203)I~, Agl, Ag(CN)2 and Ag2S are prepared. The sequential formation of each precipitate and complex ion is used to demonstrate how solubility of silver(I) compounds is related to Ksp values and the formation of soluble complex ions. An alternate procedure may be used. MaterialsProcedure A 600-ml beaker magnetic stirrer with stirring bar graduated cylinders, 10-ml, 50-ml and 250-ml 200 ml distilled water 1 ml 0.1 M Na2C03 10 ml 0.1 M AgN03 10 ml 0.1 M NaOH 30 ml 0.1 M NaCl 35 ml 5.OJWNH3 10 ml 0.1 M NaBr 50 ml 0.1 M Na2S203 10 ml 0.1 M KI 20 ml 0.1 M KCN 10 ml 0.1 M Na2S or (NH4)2S ProcedureB 1 1000-ml beaker, preferably with approximate graduations 9 150-ml beakers graduated cylinders, 10-ml, 25 ml, 50-ml and 100-ml 10 glass stirring rods 800-ml distilled water 10 beakers of sufficient size to hold the following solutions (100-ml beakers are convenient): 4 ml 0.

A blue, aqueous solution of copper(II) sulfate is mixed with a red ethanolic solution of sudan III forming a purple solution. This mixture is extracted with a nonpolar solvent, resulting in the separation of the red and blue compounds. The nonpolar solvent may be kerosene, vegetable oil, mineral oil, or hexanes. Notes on handling are included.

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Demo-Deck is a HyperCard 2.0 database that catalogs nearly 1400 chemical demonstrations published during the past 20 years in references 1 4 . Each demonstration is summarized on a separate card that gives a complete reference to the original article describing the demonstration. Each card also contains a brief description and up to ten keywords that categorize the demonstration in terms of substances used or concepts (kinetics, catalysis, activation energy, ... ). The search capabilities built into HyperCard allow you to find all cards that contain one or a pair of terms-not necessarily keywords. All words on each card are searched.Demo-Deck does not contain procedures for the cited demonstrations, since this would violate copyright restrictions; its purpose is to allow you to find original articles that contain procedures and, in many instances, information about safety and waste disposal. Demo-Deck allows you to enter your own procedure, safety information, etc. for any demonstration listed. This information is linked to Demo-Deck so that when a successful search has been done you can display your own description and procedure for the demonstration you found. Frost Diagrams is a Hypercard stack that provides an easily used format for making redox reaction predictions for one or two elements by comparing slopes of the lines connecting two oxidation states. Comparisons are simplified by copying the Frost diagram for one element to a new card, then overlaying the diagram for the second element, so that the second diagram remains transparent and movable. The two diagrams can be aligned in any way desired, and any two half reactions can be compared. In addition, some common reduction half-reactions are collected on a With all the journals, books, and other publications about chemical demonstrations, how do you actually fmd a description and a procedure for a demonstration that will effectively get across exactly the point you want to teach? Use Demo-Deck. Fred Juergens has collected in one rapidly accessible form descriptions of about 1400 chemical demonstrations to help you illustrate chemistry better. The database and search capabilities of Hypercard make this an easy-to-use and veiy valuable resource.Frost diagrams, plots of free energy versus oxidation state, are useful tools for predicting whether oxidation-reduction reactions will occur. James Birk and Heidi Hocker have made it much easier to explore Frost diagrams by using the graphics capabilities of HyperCard. Each element can be selected from a periodic table by clickingwith a mouse, its Frost diagram is quickly displayed, and diagrams for two elements can easily be overlaid and compared.In addition to Demo-Deck and Frost Diagrams, there is a note with part of the index to the Journal of Chemical Education as a text file, continuing the practice of publishing such files that was begun in our first Macintosh issue. Hardware RequirementsDemo-Deck requires a Macintosh t h a t can run Hypercard 2.0 with at least 2MB RAM, a hard disk is strongly recommended. ...