Qualitative Analysis: Calcium & Copper Reactions Explained

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When calcium ions react with aqueous ammonia, no precipitate forms because aqueous ammonia partially dissociates into NH4+ and OH- ions, resulting in only a minute amount of calcium hydroxide being produced, which remains dissolved in water. In contrast, copper ions react with a small amount of aqueous ammonia to form copper hydroxide, which precipitates out. However, when excess ammonia is added, copper hydroxide dissolves, creating a deep blue solution due to the formation of a complex ion. The discussion also touches on solubility products, indicating that calcium hydroxide is less soluble than copper hydroxide, making it easier to precipitate out of solution compared to copper hydroxide.
Celluhh
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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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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.
 
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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