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Note On Colored Molecules

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Published in: Chemistry
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Important list of colored ions and their tests.

Mukul D / Dubai

6 years of teaching experience

Qualification: Bachelor's of Engineering

Teaches: Chemistry, Mathematics, SAT, ACT, Maths

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  1. AP Chemistry — Descriptive Chemistry Colors Flame Test Colors Lit Deep red (crimson) Nat Violet Orange-red Sr2+ Red Green Blue-green Aqueous Ion Colors cui* Fe3+ C02. Mn2• Pb3. MnOa- CrO@ FeSCN2+ coaa2- Green Blue w to red-orange (depending on anion and charge of FeJ; in rare cases, can form complex ion with a deep blue color yellow-green (depending on the anion) Orange-red (depending on the anion) Violet to Green (CrC13J Green Blue-green (Pb2+ and Pb'* are colorless) Violet Blue-green Purple (Mn w/ +7 oxidation state 'S purple) Orange Dark Blue: produced when ammonia is added to Cu2+ solutions Red-brown, Wine-red to dark orange Blue (C02* with HCI Will form a COC142- complex that is blue) Purple Al, K, Li, Mg, No, Co, BC, Sr, Zn are colorless aqueous ions and most of their solid salts are white. Transition element ions with partially filled d orbitals tend to release colored light. Assorted Compounds C12 12 NO NOZ Pb12 Metallic sulfides F-ez03 Metallic Oxides Pale-yellow gas gas Red-brown liquid Dark-violet vapor & dark metallic looking solid Red-brown, odorous solid Colorless gas; associated with reactions between metals and dilute HN03 Brown gas; associated with reactions between metals and concentrated HNOg Bright precipitate Sulfides of transition metals tend to be black Reddish brown (rust) Oxides of colored transition metal ions tend to be colored Acid-Base Indicators Phenolphthalein Red Litmus (paper) Blue Litmus (paper) Colorless (pH<7) to Pink (pH>8 ; when OH- is present) Turns blue/purple in alkaline solution Turns red/pink in acidic solution

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