Which solution will turn red litmus paper blue?

NH₄Cl(aq)
NaCl(aq)
Na₃PO₄(aq)
HCl(aq)

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Na₃PO₄ is a salt of a strong base (NaOH) and a weak acid (H₃PO₄). The phosphate ion hydrolyzes to produce OH⁻, making the solution basic, which turns red litmus blue.

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