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A 100mL portion of a 0.1000mol·L -1 aqueous solution of the weak acid HA is extracted with 50.00mL of CCl 4 . After the extraction,a 25.00mL aliquot of the aqueous phase was titrated with 10.00mL of a 0.1000mol·L -1 NaOH. Calculate the distribution ratio of HA.