CHEM 18B Lecture 1: LabS211-13
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Department
Chemistry
Course
CHEM 18B
Professor
Deirdra Evers- Mc Gregor
Semester
Spring

Description
Lab 11 Part1: Precipitation reaction- combination of two aqueous ionic solutions that produce a solid (the precipitate) Qualitative analysis vs. quantitative analysis - observations are extremely important A precipitate is formed with qualitative analysis (without numbers) Binary mixtures: NaOH, NH , BaCl4, MgSO 2 KIO , Ag4O , N3 CO , HNO3 2 3 3 n x (n-1)/2 → n=8, 28 possible combinations Solubility rules KBr(aq) + AgNO (aq)3→ K + Br + Ag + NO → K + 3O + AgBr(s) 3- Br + Ag → AgBr(s) Part2: 4 solutions with cations: Co , Cu , Fe , Ni 3+ 2+ 4 test solutions: KNO , N2 , HD3G, KI Electron transfer reactions OILRIG Precipitation reactions Net ionic equations Lab 12 Identify the same solutions except they will be unknowns Also identify metal cations in an unknown mixture using selective separation To do selective separation use specific reagents to precipitate components out one at a time Weak base + weak acid ← > conjugate + conjugate Lab 13 Coordination (complex) compound - neutral compound with central metal in surrounded by ligands and combined with counterions Ligand - lewis base (an electron donor) that forms a bond with metal - Bond with a metal - NH ,3Cl - Goal is the synthesis to 2 coordination
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