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19. 7.998 g of NaOH were used to neutralize 9.797 g of orthophosphoric acid. Calculate the equivalent, equivalent mass and basicity of H3PO4 in this reaction. Based on the calculation, write the equation of the reaction.

Answer: 0.5 mol, 49 g / mol, 2.

Answer: 0.5 mol, 49 g / mol, 2.

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