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Qualitative analysis

by Celluhh
Tags: analysis, qualitative
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Celluhh
#1
May6-12, 09:35 PM
P: 219
I'm just learning the basics, but I have a few questions.
Why is it that there is no precipitate formed when calcium ions react with aqueous ammonia?
Why is it that copper ions reactwith A little aqueous ammonia to form copper hydroxide precipitatinput dissolves in excess aqueous ammonia to form a solution???
All help will be greatly appreciated thank you !
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sgstudent
#2
May6-12, 11:18 PM
P: 645
Aqueous ammonia partially dissociate into NH4+ and OH- ions. So any calcium hydroxide formed will be a minute amount hence, it is able to dissolve in water leaving no precipitate. Copper (ii) hydroxide continues to react with the solution to form a deep blue solution.
Borek
#3
May7-12, 01:59 AM
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P: 23,540
Do you know what solubility product is? If so, compare solubility products of calcium hydroxide and copper hydroxide - which one is more soluble? Which one is easier to precipitate out of the solution?


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