Welcome to the Quiz!

This quiz contains 8 questions from a mix of 1 subtopics.

What are complex ions in aqueous transition element solutions?

ions with ammonia ligands

ions with chloride ligands

ions with water molecules acting as ligands

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What type of bonds are formed between water molecules and the central metal ion in complex ions?

dative (coordinate) bonds

ionic bonds

covalent bonds

hydrogen bonds

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What is the expression for the stability constant for the following equilibrium?

[Cu(H2O)6]2+ + 4Cl-(aq) ⇌ [CuCl4]2-(aq) + 6H2O(l)

Kstab ​=[[Cu(H2​O)6​]2+][Cl−][[CuCl4​]2−][H2​O]6​
Kstab ​=[[CuCl4​]2−][[Cu(H2​O)6​]2+][Cl−]4​
Kstab ​=[[Cu(H2​O)6​]2+][Cl−]4[[CuCl4​]2−][H2​O]6​
Kstab ​=[[Cu(H2​O)6​]2+][Cl−]4[[CuCl4​]2−]​

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What does the value of Kstab tell you about about a complex ion?

what colour it is

how reactive it is

how stable it is

how concentrated it is

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The smaller the stability constant value the stable the complex ion is.

less

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What are the units for Kstab in the equation below?

Kstab ​=[[Co(H2​O)6​]2+][Cl−]4[[CoCl4​]2−]​

mol-1 dm3

mol dm-3

mol-4 dm12

mol4 dm-12

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Which nickel complex would you expect to have the largest Kstab value?

(en = 1,2-diaminoethane).

[Ni(en)3]2+

[Ni(en)(H2O)4]2+

[Ni(en)2(H2O)2]2+

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What happens when concentrated aqueous ammonia is added to an aqueous solution of copper(II) sulfate?

the ammonia ligands displace water ligands

the water ligands displace ammonia ligands

the water ligands displace sulfate ligands

the ammonia ligands displace sulfate ligands

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