Answer :

nothing happens

2NaNO₃(aq) + BaCl₂(aq) ⇄ 2NaCl(aq) + Ba(NO₃)₂(aq)

2Na⁺ + 2NO₃⁻ + Ba²⁺ + 2Cl⁻ ⇄ 2Na⁺ + 2Cl⁻ + Ba²⁺ + 2NO₃⁻

after evaporation of solution four salts crystallize

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