某1L含0.3mol/LNaOH和0.2mol/LH3PO4的溶液,其pH值为()(已知pKa(H3PO4):2.127.2012.36) A: 2.12 B: 4.66 C: 7.20 D: 9.78
某1L含0.3mol/LNaOH和0.2mol/LH3PO4的溶液,其pH值为()(已知pKa(H3PO4):2.127.2012.36) A: 2.12 B: 4.66 C: 7.20 D: 9.78
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