CHEM 18b Lecture Notes - Lecture 1: Buffer Solution, Limiting Reagent, Silver Bromide

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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, NH4, BaCl2, MgSO4, KIO3, AgNO3, Na2CO3, HNO3
n x (n-1)/2 → n=8, 28 possible combinations
Solubility rules
KBr(aq) + AgNO3(aq) →
K+ + Br- + Ag+ + NO3- → K+ + NO3- + AgBr(s)
Br- + Ag+ → AgBr(s)
Part2:
4 solutions with cations: Co2+, Cu2+, Fe3+, Ni2+
4 test solutions: KNO2, NH3, HDMG, 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
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Document Summary

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, nh4, bacl2, mgso4, kio3, agno3, na2co3, hno3 n x (n-1)/2 n=8, 28 possible combinations. 4 solutions with cations: co2+, cu2+, fe3+, ni2+ 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. 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. Goal is the synthesis to 2 coordination compounds containing co3+, nh3, cl- Both have cobalt in middle with 6 things bonded to it. First case has 6 nh3 making complex ion you have 3 cl- counterions.

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