Coordination Chemistry: how many ions formed when dissolved

AI Thread Summary
The discussion revolves around the dissolution of coordination compounds in water and the resulting moles of ions produced. The initial confusion stems from the expectation that dissolving one mole of [Co(NH3)4Cl2]Cl would yield one mole of Cl- ions, but the correct answer is two moles due to the dissociation of both chloride ions. Similarly, for [Co(NH3)4]Cl3, the dissolution results in four moles of ions rather than three, as it includes the dissociation of all ions present in the compound. The clarification emphasizes that the questions focus on the total number of moles of ions formed, not just the chloride ions.
bluepen
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Hey,

[Co(NH3)4Cl2]Cl

I don't understand how there isn't just one mole of Cl- ions formed when you dissolve one mole of the compound in water. The answer is '2 moles', but I don't see how :(

Another example is
[Co(NH3)4]Cl3
How many moles of ions are formed when 1 mole of this compound dissolves in water?
How is not just 3? The answer says it's 4 moles...

The questions are from this website, which I found quite helpful to quickly revise the topic.
http://www.chem.purdue.edu/gchelp/116exams/index.html

:smile: Thanks!
 
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It seems you misunderstood the question. The problems ask for the total number of moles of ions, not the number of moles of chloride ions.
 
I knew it had to be that obvious! Thanks a million espen180:smile:
 

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