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3 NaOH + H3PO3 ----> Na3PO3 + 3 H2O

In this case 3 mol sodium hydroxide reacts with 1 mol phosphorous acid to make 1 mol sodium phosphite and 3 mol water.

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Q: What is the number of units of NaOH needed to react with 1 unit of H3PO3 to form Na3PO3 and H2O?
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