24 Questions
What is the coordination number of the metal-ion M in Curve A?
Four
What is the type of ligand that forms a complex with metal-ion M in Curve C?
Unidentate
What is the number of potential sites for bonding a metal ion in EDTA?
Six
What is the ratio of EDTA to metal ions in a reaction?
1:1
Why is an auxiliary complexing agent needed in some EDTA titrations?
To keep the cation in solution
What is another use of EDTA besides being a titrant?
As a food preservative
What type of reagents are used in Complex-Formation Titrations?
Organic compounds that contain several electrondonor groups
What is the typical coordination number for most metal ions?
Two, four, and six
What is the term for the species formed as a result of coordination?
Coordination compound
What is the advantage of using multidentate ligands over unidentate ligands?
They generally react more completely with cations and provide sharper end points
What is the term for a ligand with two donor groups?
Bidentate
What is the term for a process where a metal ion coordinates with two or more donor groups of a single ligand to form a five- or six-membered heterocyclic ring?
Chelation
What is the primary purpose of using a medium with high concentrations of ammonia and ammonium chloride in zinc(II) titration?
To reduce the interference of other metal ions
What is the characteristic of Eriochrome Black T that makes it useful as an indicator in EDTA titrations?
It forms red complexes with more than two dozen metal ions
What is the definition of water hardness in terms of the concentration of calcium and magnesium ions?
It is the total concentration of calcium and magnesium ions expressed as the concentration of calcium carbonate
What type of reaction is the basis of precipitation titrations?
Reactions that yield ionic compounds of limited solubility
What is the primary use of silver nitrate in titrations?
To determine the concentration of halogens and halogenlike anions
What is the characteristic of indicators used in argentometric titrations?
They respond to changes in the concentration of silver ions
What is the typical plot of a titration curve for precipitation reactions?
pAg versus volume of the silver reagent
What is the effect of increasing the solubility product on the sharpness of the end point?
The end point becomes less sharp
What is the role of iron(III) in the Volhard method?
It serves as an indicator
What is the result of adding a slight excess of thiocyanate ion to the solution in the Volhard method?
The solution turns red
What is the most important application of the Volhard method?
Indirect determination of halide ions
What is the reason why silver chloride is not used in the Volhard method?
Silver chloride is more soluble than silver thiocyanate
Test your knowledge on complex-forming titrations, coordination compounds, and metal ion reactions with electron-pair donors. Learn about the role of ligands and unshared electrons in complex-formation reactions.
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