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6.5 g KOH, NaOH and Na2CO3 were dissolved in water and made up to 250 mL. 25 mL of this solution requires 26.23 mL of seminormal H2SO4 when methyl orange is used as an indicator. Another 25 mL of this solution requires 19.5 mL seminormal sulphuric aicd using phenolphthalein as an indicator. Find the % composition by mass of the mixture.