Qualitative Analysis: Calcium & Copper Reactions Explained

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In summary, the conversation discusses the lack of precipitate formed when calcium ions react with aqueous ammonia and the formation of copper hydroxide precipitate in the presence of aqueous ammonia. It is explained that the partial dissociation of aqueous ammonia results in a small amount of calcium hydroxide, which dissolves in water and does not form a precipitate. The solubility product of copper hydroxide is compared to that of calcium hydroxide, with copper hydroxide being more soluble and easier to precipitate out of the solution.
  • #1
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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  • #2
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.
 
  • #3
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?
 

Related to Qualitative Analysis: Calcium & Copper Reactions Explained

What is qualitative analysis?

Qualitative analysis is a method used in chemistry to identify the presence or absence of certain elements or compounds in a sample. It involves observing the physical and chemical properties of a substance to determine its composition.

What is calcium?

Calcium is a chemical element with the symbol Ca and atomic number 20. It is a soft, silvery-white alkaline earth metal that is essential for living organisms and is the fifth most abundant element in the Earth's crust.

What is copper?

Copper is a chemical element with the symbol Cu and atomic number 29. It is a soft, malleable, and ductile metal with a reddish-orange color. Copper is commonly used in electrical wiring, plumbing, and as a component in various alloys.

How do calcium and copper react?

Calcium and copper can react to form a compound called calcium copper oxide (CaCuO). This reaction usually occurs when calcium and copper are heated together in a flame or in the presence of oxygen. The resulting compound is a dark brown or black solid.

What is the purpose of qualitative analysis for calcium and copper reactions?

The purpose of qualitative analysis for calcium and copper reactions is to identify the presence of these elements in a sample based on their unique physical and chemical properties. This information can be useful in determining the composition of a substance and its potential uses in various industries.

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