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q. why is sodium aluminates is a better

Q. why is sodium aluminates is a better coagulates then ferrous sulphates or alum?

Ans. Sodium aluminates (NaAlO₂): It is better coagulant than FeSO₄ and alum because it easily hydrolyzes.

2NaAlO₂ + 2H₂O =2NaOH + Al (OH₂)₃

Sodium hydroxide formed as per the above reaction precipitates Mg⁺² salts.

MgCl₂ + 2NaOH = Mg (OH) ₂ + 2NaCl

Both Al (OH) ₃ and Mg (OH)₃ are flocculent precipitates and they easily trap any finely suspended and colloidal impurities such as silica and oil.

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