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A mixture contains 1.0 mole each of NaOH...

A mixture contains 1.0 mole each of NaOH,`Na_(2)``CO_(3)` and `NaHCO_(3)`. When half of mixture is titrated with HCl ,it required x mole of HCl in presence of phenolphthalein. In another experiment ,half of mixture required y mole of same HCl in presence of methyl orange. Find the value of (x+y).

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