A solution contains ${\rm{N}}{{\rm{a}}_2}{\rm{C}}{{\rm{O}}_3}$ and ${\rm{NaHC}}{{\rm{O}}_3}.$ 10 mL of the solution required 2.5 mL of $0.1\;M\;{{\rm{H}}_2}{\rm{S}}{{\rm{O}}_4}$ for neutralization using phenolphthalein as indicator. Methyl orange is then added when a further 2.5 mL of $0.2\;M\;{{\rm{H}}_2}{\rm{S}}{{\rm{O}}_4}$ was required. The amount of ${\rm{N}}{{\rm{a}}_2}{\rm{C}}{{\rm{O}}_3}$ in 1 litre of the solution is:Failed to load question data. Please try again later.
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