Is there any reaction happens when calcium ion added to calcium hydroxide?

AI Thread Summary
The discussion centers on the reaction between calcium ions and calcium hydroxide. When calcium hydroxide is added to calcium ions, the outcome depends on the initial concentrations of the solutions involved. If calcium hydroxide (Ca(OH)2) is present in a high concentration, it can precipitate as an insoluble compound when concentrated calcium chloride (CaCl2) is added. However, calcium hydroxide is weakly soluble, with a maximum solubility of about 2 g per liter, which limits its concentration in solution. The conversation also touches on the comparison with diluted ammonia, clarifying that the low concentration of hydroxide ions in diluted solutions may not lead to precipitation, unlike the scenario with concentrated calcium chloride. The solubility product concept is mentioned as a key factor in understanding these reactions.
Green18
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Silly question lol
But Is there any reaction if calcium ion added to calcium hydroxide?

If NaOH or any alkali is added to metal ions, insoluble metal hydroxide is formed.
So, what if weak alkali Calcium hydroxide is added to Calcium ion, what will it happen? Will it has no reaction just like it is added to ammonia solution with the reason of concentration of OH{-} in dilute ammonia is low? Or it becomes part of the calcium hydroxide?Or calcium hydroxide white percipitate will form?
 
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Depends on the initial concentrations. Such a solution is described by the solubility product. Have you heard about it yet?
 
Borek said:
Depends on the initial concentrations. Such a solution is described by the solubility product. Have you heard about it yet?
Ummm no, haven't heard about it :(
It's about the initial concentration. Does it mean (let say we have Ca(OH)2 and CaCl2) if the Ca(OH)2 has a relative high concentration, then it can form insoluble Ca(OH)2?
 
Yes, you should be able to precipitate Ca(OH)2 from the Ca(OH)2 solution just by adding concentrated CaCl2.

However, you can't have Ca(OH)2 with a "relatively high concentration". Ca(OH)2 is weakly soluble, below 2 g per 1L if memory serves me well.
 
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I see :) Thank you so much! :)
 
Borek said:
Yes, you should be able to precipitate Ca(OH)2 from the Ca(OH)2 solution just by adding concentrated CaCl2.

However, you can't have Ca(OH)2 with a "relatively high concentration". Ca(OH)2 is weakly soluble, below 2 g per 1L if memory serves me well.
Uh! But …since the concentration of Ca(OH)2 can't be high, than its concentration of OH- (aq) ions in dil. Ca(OH)2 must be low, then, wouldn't it have the same situation as it reacts with dil aqueous ammonia, and does not give precipitate?
 
No, that's a different situation. You mentioned "diluted ammonia", I have specifically called for concentrated CaCl2.

Doesn't mean concentrated ammonia will be able to precipitate Ca(OH)2. It is rather easy to calculate, but using theory that you don't know yet.
 
Ohh (facepalm) sorry for my misunderstanding. Ok, i will let go of it then :p
 
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