Download Understanding Coordination Compounds: Terms and Concepts and more Quizzes Chemistry in PDF only on Docsity!
electron-donors
Most metal ions react with _________ to form coordination compounds or complexes TERM 2
ligand
DEFINITION 2 donor species TERM 3
one pair of unshared electrons
DEFINITION 3 Donor species or ligand must have at least __________________ TERM 4
Water, ammonia, and halide ions
DEFINITION 4 _____________, ______________, and ______________are common examples of ligands TERM 5
coordination
number
DEFINITION 5 Number of covalent bonds that a cation tends to form with an electron donor is its ________
2, 4, and 6
Typical values of coordination numbers are ______________ TERM 7
positive , neutral, or negative
DEFINITION 7 Species formed by coordination can be electrically _________, ___________, or ____________ TERM 8
chelate
DEFINITION 8 A ____________ is produced when a metal ion coordinates with two or more donor groups of a single ligand to form a five- or six membered heterocyclic ring TERM 9
unidentate bidentate
DEFINITION 9 A ligand that has a single donor group is called _________ A ligand that has two donor groups is called __________ TERM 10
macrocycle
DEFINITION 10 A __________________ is formed between a metal ion and a cyclic organic compound
EDTA combines with metal ions in a _________ ratio regardless of the charge on the cation TERM 17
Conditional, or effective, formation constants
DEFINITION 17 pH dependent equilibrium constants that apply at a single pH only. TERM 18
Fe y, Hg y2, Zn y2, Fe y2, Ca y
DEFINITION 18 EDTA titration curves Ky order from top to bottom TERM 19
Indicators for EDTA titrations
DEFINITION 19 Organic dyes that form colored chelates with metal ions in a pM range that is characteristic of the particular cation and dye TERM 20
Eriochrome Black T and calcon
DEFINITION 20 Indicators for EDTA titrations
red
the indicators for EDTA form __________ complexes in the presence of metal ions TERM 22
blue
DEFINITION 22 when the EDTA complexes all of the metal in the solution, the color of the indicator changes to __________ TERM 23
back titration
DEFINITION 23 measured excess of EDTA solution is added to the analyte. The excess EDTA is titrated with an appropriate standard metal ion solution to a Eriochrome Black T end point TERM 24
displacement method
DEFINITION 24 unmeasured excess of a solution containing the magnesium or zinc complex of EDTA is added to the analyte solution. If the analyte forms a more stable complex with EDTA a displacement reaction occurs. The displaced Mg2+ or Zn2+ is then titrated with standard EDTA solution. TERM 25
Spectrophotometric Potentiometric
DEFINITION 25 two types of direct titrations
iodide triiodide
oxidant converts ________ to ________ in the flask during an iodometric titration TERM 32
iron sodium thiosulfate
DEFINITION 32 Common reducing agents-- used to determine oxidants in an iodometric titration TERM 33
iodimetric
DEFINITION 33 In ____________ titrations, the analyte (a reducing agent) reacts with iodine to produce iodide TERM 34
iodometric
DEFINITION 34 In _____________ titrations, the analyte (an oxidizing agent) reacts with an unmeasured excess of iodide to produce iodine
