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Selective Precipitation in Chemistry

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Questions and Answers

What is the chemical formula for hydroxylapatite, a precipitate formed during phosphate removal from water?

Fe2(SO4)3

CaCl2

Ca5(PO4)3OH (correct)

Ca(OH)2

How is the solubility of an ionic compound affected in aqueous solutions with a common ion?

It remains the same

It increases

It decreases (correct)

It fluctuates randomly

Which chemical is NOT mentioned as a possible option for removing phosphates by precipitation?

Silver iodide

Iron(III) chloride

Calcium hydroxide (correct)

Aluminum sulfate

In the solubility equilibrium of silver iodide, what would the addition of silver(I) ions result in?

Decreased solubility of AgI Signup and view all the answers

What principle explains the phenomenon where the solubility of an ionic compound decreases in the presence of a common ion?

Le Châtelier’s principle Signup and view all the answers

What is the purpose of adding CO2 in the recarbonation process during phosphate removal from water?

To neutralize the water Signup and view all the answers

What is the primary purpose of selective precipitation in wastewater treatment?

To remove contaminants from wastewater before it is released into natural bodies of water Signup and view all the answers

In a solution containing multiple ions that can form insoluble compounds with the same counter ion, what determines the order in which the ions precipitate during selective precipitation?

The solubility of the compounds formed by the ions with the counter ion Signup and view all the answers

Which of the following statements about selective precipitation is not true?

It is only applicable when all ions in the solution have the same solubility product constants Signup and view all the answers

In the context of wastewater treatment, why is it important to remove phosphate ions ($\mathrm{PO_4^{3-}}$) from the water before it is released into natural bodies of water?

An abundance of phosphate ions can cause excess algae growth, leading to oxygen depletion and water unsuitable for human consumption Signup and view all the answers

In a solution containing equal concentrations of two target ions that can form insoluble compounds with a counter ion, which ion will precipitate first when the counter ion is added?

The ion forming the compound with the lower solubility product constant Signup and view all the answers

What is the purpose of adding the counter ion in a controlled manner during selective precipitation?

To precipitate the ions in a specific order based on their solubility differences with the counter ion Signup and view all the answers