Which option lists the correct formula for caustic soda?

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Multiple Choice

Which option lists the correct formula for caustic soda?

Explanation:
Caustic soda is the common name for sodium hydroxide, with the chemical formula NaOH. It’s a strong base used to raise pH and adjust alkalinity in water treatment. The options all describe phosphate-containing compounds, not hydroxide. Sodium hexametaphosphate (Na6P6O18) is a polymeric phosphate salt used as a sequestrant; sodium zinc phosphate is a mixed metal phosphate salt; orthophosphate crystals and zinc orthophosphate crystals are phosphate salts involving PO4 units, not hydroxide. So the actual formula for caustic soda is NaOH, which is not listed among the choices.

Caustic soda is the common name for sodium hydroxide, with the chemical formula NaOH. It’s a strong base used to raise pH and adjust alkalinity in water treatment. The options all describe phosphate-containing compounds, not hydroxide. Sodium hexametaphosphate (Na6P6O18) is a polymeric phosphate salt used as a sequestrant; sodium zinc phosphate is a mixed metal phosphate salt; orthophosphate crystals and zinc orthophosphate crystals are phosphate salts involving PO4 units, not hydroxide. So the actual formula for caustic soda is NaOH, which is not listed among the choices.

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