Podcast
Questions and Answers
What is the chemical formula for hydroxylapatite, a precipitate formed during phosphate removal from water?
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?
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?
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?
In the solubility equilibrium of silver iodide, what would the addition of silver(I) ions result in?
What principle explains the phenomenon where the solubility of an ionic compound decreases in the presence of a common ion?
What principle explains the phenomenon where the solubility of an ionic compound decreases in the presence of a common ion?
What is the purpose of adding CO2 in the recarbonation process during phosphate removal from water?
What is the purpose of adding CO2 in the recarbonation process during phosphate removal from water?
What is the primary purpose of selective precipitation in wastewater treatment?
What is the primary purpose of selective precipitation in wastewater treatment?
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?
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?
Which of the following statements about selective precipitation is not true?
Which of the following statements about selective precipitation is not true?
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?
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?
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?
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?
What is the purpose of adding the counter ion in a controlled manner during selective precipitation?
What is the purpose of adding the counter ion in a controlled manner during selective precipitation?
