6.乙酸–乙酸钠缓冲液(0.2 mol/L)
pH(18℃) |
0.2 mol/L NaAc (毫升) |
0.3 mol/L HAc (毫升) |
pH(18℃) |
0.2 mol/L NaAc (毫升) |
0.3 mol/L HAc (毫升) |
2.6 3.8 4.0 4.2 4.4 4.6 |
0.75 1.20 1.80 2.65 3.70 4.90 |
9.25 8.80 8.20 7.35 6.30 5.10 |
4.8 5.0 5.2 5.4 5.6 5.8 |
5.90 7.00 7.90 8.60 9.10 9.40 |
4.10 3.00 2.10 1.40 0.90 0.60 |
Na2Ac·3H2O分子量 = 136.09,0.2 mol/L溶液为27.22克/升。
7.磷酸盐缓冲液
(1)磷酸氢二钠–磷酸二氢钠缓冲液(0.2)
pH |
0.2 mol/L Na2HPO4 (毫升) |
0.3 mol/L NaH2PO4 (毫升) |
pH |
0.2 mol/L Na2HPO4 (毫升) |
0.3 mol/L NaH2PO4 (毫升) |
5.8 5.9 6.0 6.1 6.2 6.3 6.4 6.5 6.6 6.7 6.8 6.9 |
8.0 10.0 12.3 15.0 18.5 22.5 26.5 31.5 37.5 43.5 49.5 55.0 |
92.0 90.0 87.7 85.0 81.5 77.5 73.5 68.5 62.5 56.5 51.0 45.0 |
7.0 7.1 7.2 7.3 7.4 7.5 7.6 7.7 7.8 7.9 8.0 |
61.0 67.0 72.0 77.0 81.0 84.0 87.0 89.5 91.5
93.0 |
39.0 33.0 28.0 23.0 19.0 16.0 13.0 10.5 8.5 7.0 5.3 |
Na2HPO4·2H2O分子量 = 178.05,0.2 mol/L溶液为85.61克/升。
Na2HPO4·12H2O分子量 = 358.22,0.2 mol/L溶液为71.64克/升。
Na2HPO4·2H2O分子量 = 156.03,0.2 mol/L溶液为31.21克/升。
(2)磷酸氢二钠–磷酸二氢钾缓冲液(1/15 mol/L)
pH |
mol/L/15Na2HPO4 (毫升) |
mol/L//15KH2PO4 (毫升) |
pH |
mol/L//15Na2HPO4 (毫升) |
mol/L//15KH2PO4 (毫升) |
4.92 5.29 5.91 6.24 6.47 6.64 6.81 6.98 |
0.10 0.50 1.00 2.00 3.00 4.00 5.00 6.00 |
9.90 9.50 9.00 8.00 7.00 6.00 5.00 4.00 |
7.17 7.38 7.73 8.04 8.34 8.67 8.18 |
7.00 8.00 9.00 9.50 9.75 9.90 10.00 |
3.00 2.00 1.00 0.50 0.25 0.10 0 |
Na2HPO4·2H2O分子量 = 178.05,1/15M溶液为11.876克/升。
KH2PO4分子量 = 136.09,1/15M溶液为9.078克/升。
8.磷酸二氢钾–氢氧化钠缓冲液(0.05M)
X毫升0.2M K2PO4 + Y毫升0.2N NaOH加水稀释至29毫升
pH(20℃) |
X (毫升) |
Y(毫升) |
pH(20℃) |
X (毫升) |
Y(毫升) |
5.8 6.0 6.2 6.4 6.6 6.8 |
5 5 5 5 5 5 |
0.372 0.570 0.860 1.260 1.780 2.365 |
7.0 7.2 7.4 7.6 7.8 8.0 |
5 5 5 5 5 5 |
2.963 3.500 3.950 4.280 4.520 4.680 |