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Se disuelve una muestra de 2,50 g que contiene As2O5, Na2HAsO3 y material inerte y se ajusta el pH a neutro con exceso de NaHCO3.

Se disuelve una muestra de 2,50 g que contiene As2O5, Na2HAsO3 y material inerte y se ajusta el pH a neutro con exceso de NaHCO3. El As(III) se titula con una solucin de I2 0,150 M, lo que requiere 11,3 ml para alcanzar el punto final. Luego, la solucin (todo el arsnico en el estado +5 ahora) se acidifica con HCl, se agrega exceso de KI y el I2 liberado se titula con Na2S2O3 0.120 M, lo que requiere 41.2 mL. Calcule el porcentaje de As2O5 y Na2HAsO3 en la muestra.

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