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A colorless, transparent solution may contain some of Na+\mathrm{Na^+}, Cu2+\mathrm{Cu^{2+}}, NH4+\mathrm{NH_4^+}, Cl−\mathrm{Cl^-}, CO32−\mathrm{CO_3^{2-}} and SO42−\mathrm{SO_4^{2-}}. Two experiments are done. (1) NaOH\mathrm{NaOH} solution is added to a sample and heated; a gas that turns moist red litmus paper blue is released. (2) Excess Ba(NO3)2\mathrm{Ba(NO_3)_2} solution is added to another sample, giving a white precipitate; after filtration, excess dilute nitric acid is added to the precipitate, which dissolves completely with a colorless gas given off. Which conclusion is correct? ( ).
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