Chemical treatment of municipal water supplies commonly entails use of CaO, Al 2 (SO 4 ) 3 , and Cl 2 . The purpose of adding CaO is to __________.

CaO is added to make the water slightly basic, which helps in the formation of a gelatinous precipitate of Al(OH)3 when Al2(SO4)3 is added.

Chemical treatment of municipal water supplies commonly entails use of CaO, Al 2 (SO 4 ) 3 , and Cl 2 . The purpose of adding CaO is to __________.

CaO is added to make the water slightly basic, which helps in the formation of a gelatinous precipitate of Al(OH)3 when Al2(SO4)3 is added.

Solved

Chemical Treatment of Municipal Water Supplies Commonly Entails Use of CaO

Question 41

Multiple Choice

Chemical treatment of municipal water supplies commonly entails use of CaO, Al₂(SO₄) ₃, and Cl₂. The purpose of adding CaO is to __________.

A) remove all HCO₃^- as solid CaCO₃
B) remove all SO₄^2- as solid CaSO₄
C) remove all Cl^-as solid CaCl₂
D) selectively kill anaerobic (but not aerobic) bacteria
E) make the water slightly basic so that addition of Al₂(SO₄) ₃will afford a gelatinous precipitate of Al(OH) ₃