pH 6.0 磷酸氢二钠-磷酸二氢钠缓冲液（0.2 mol/L）配比0.2 mol/LNa2HPO4 (mL) 12.30.2 mol/LNaH2PO4 (mL) 87.7Na2HPO4•2H2O分子量＝178.05；0.2 mol/L溶液为35.61 g/L.Na2HPO4•12H2O分子量＝358.22；0.2...