Sodium Aluminates Assignment Help

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Sodium Aluminates NaAlO2

This white powdery compound of sodium hydroxide and aluminum oxide is usually used in conjunctions with commercial aluminum sulphate in drinking water treatment. The aluminate (5-10% of dosed alum) if added about 30 seconds before the alum, makes the flocs denser and the coagulation is effective over a wider pH range. Sodium aluminate reacts as follows

NaAlO2 + Ca (HCO3)2 + H2O → Al (OH)3 (ppt) + CaCO3 (ppt) + NaHCO3

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