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- Ammonium Dichromate Volcano – Reduce chromium from +6 to +3 by igniting an (NH4)2Cr2O7 volcano in an aquarium to produce N2 (g), H2O (g), and Cr2O3 (s).
- Chromate-Dichromate Equilibrium – Show the pH dependence of the CrO42-/Cr2O72- system.
- Cobalt Complexes and Temperature v2.0 AU19 – Show the color change observed when octahedral [Co(H2O)6]2+ is converted to tetrahedral [CoCl4]2-.
- Nickel and Cobalt Ammine complex – show the dependence of color on both the metal ion and its oxidation state by first adding concentrated NH3 (aq) to dilute solutions of Ni(NO3)2 and Co(NO3)2 and then adding part of the [Co(NH3)6](NO3)2 (aq) to a flask charged with O2 (g) to oxidize the Co2+ to Co3+ and show the accompanying color change.
- Complex Ion Formation- Ni and Cu – In a tall graduated cylinder – carefully add 6 M NH3 (aq) to 1 M CuSO4 (aq) (or NiNO3) to obtain a layering effect with the Cu2+ (aq), Cu(OH)2 (s), and Cu(NH3)42+ (aq).
- Ferromagnetism – Demonstrate ferromagnetism by inserting a cow magnet into a test tube inside a glass bottle containing iron filings – the resulting arrangement of the iron filings shows the three-dimensional shape of the magnetic field
- Multiple Oxidation States of Manganese – Starting with KMnO4(aq) in four beakers, carry out reactions to display manganese in the +7, +4, +3, and +2 oxidation states
- Multiple Oxidation States of Vanadium – Shake a solution of ammonium meta-vanadate with a Zn-Hg amalgam to reduce the vanadium from +5 to +4 to +3 to +2 with different colors at each stage
- Paramagnetic and Diamagnetic salts – Provide experimental evidence of electron spin by bringing a powerful magnet close to suspended test tubes of MnSO4, FeSO4, NiSO4, and ZnSO4 to show the different responses due to different numbers of unpaired electrons.
- Penny vs Nitric Acid – Read Ira Remson’s own account of his first encounter with chemistry as you repeat his experiment by pouring concentrated nitric acid over a copper penny.
- Precipitates and Complexes of Ni – Add different amounts of ethylenediamine to beakers of Ni2+ to contrast the colors of Ni(H2O)62+ and the Ni2+ chelate complexes with one, two, and three ethylenediamine molecules.
- Precipitates and Complexes of Ag – Add a series of 7-9 reagents to Ag+ (aq) in succession to produce a series of precipitates and complexes.