A mixed solution of \( \mathrm{KOH} \) and \( \mathrm{Na}_{2} \mathrm{CO}_{3} \) required \( 20 ...

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A mixed solution of \( \mathrm{KOH} \) and \( \mathrm{Na}_{2} \mathrm{CO}_{3} \) required \( 20 \mathrm{~mL} \) of \( \mathrm{N} / 20 \mathrm{HCl} \) solution when titrated using phenolphthalein as indicator. But the same volume of solution when titrated using methyl orange as indicator required \( 30 \mathrm{~mL} \) of the same acid. Calculate the mass of \( \mathrm{KOH} \) and \( \mathrm{Na}_{2} \mathrm{CO}_{3} \).
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