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Polyatomic Ions. Sulfate. SO 4 2-. Nitrate. NO 3 1 -. Phosphate. PO 4 3 -. Chlorate. ClO 3 1 -. Perchlorate. ClO 4 1 -. Sulfite. SO 3 2-. Hydroxide. OH 1-. Ammonium. NH 4 1+. Acetate. CH 3 COO 1-.
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