0.4 g mixture of NaOH , $N a_{2} C O_{3}$ and some inert impurities was first titrated with N/10 HCl using phenolphthalein as an indicator, 17.5 mL of HCl was required at the end point. After this methyl orange was added and titrated. 1.5 mL of same HCl was required for the next end point. The weight percentage of $N a_{2} C O_{3}$ in the mixture is________(Rounded off to the nearest integer).

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answer is 4.

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Detailed Solution

(4) Eq. of NaOH = Eq. of HCl (phenolphthalein)
Eq. of HCl = Eq. of $N a_{2} C O_{3}$ (methyl orange)
Weight = Eq. wt x No. of eq.

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