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

Question

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The addition of CaO (calcium oxide) to water results in the formation of calcium hydroxide, which increases the pH of the water, making it slightly basic. This condition is necessary for the subsequent addition of aluminum sulfate to form a gelatinous precipitate of aluminum hydroxide, which helps in water purification by coagulating and removing impurities.

Chemical Treatment of Municipal Water Supplies Commonly Entails Use of CaO,Al2(SO4)3,and

Chemical Treatment of Municipal Water Supplies Commonly Entails Use of CaO,Al₂(SO₄)₃,and