PH=7.20+lg(C1C2)=7.20+lg(0.0040.05)=7.20+lg0.08=7.20−1.09691001=6.10PH=7.20+lg(\frac{C1}{C2})=7.20+lg(\frac{0.004}{0.05})=7.20+lg0.08=7.20-1.09691001=6.10PH=7.20+lg(C2C1)=7.20+lg(0.050.004)=7.20+lg0.08=7.20−1.09691001=6.10
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