标准溶液 | 25℃的pH | 每1000ml25℃水溶液 |
(溶质的质量mol浓度,molkg—1) | 所需药品重量 | |
基本标准 | 3.557 | 6.4g KHC4H4O8① |
酒石酸氢钾(25℃饱和) | 3.776 | 11.4g KH2C6H5o7 |
0.05m柠檬酸二氢钾 | 4.028 | 10.1g KHC8H4o4 |
0.05m邻苯二甲酸氢钾 | 6.865 | 3.388g KH2Po4+ |
0.025m磷酸二氢钾+ | 7.413 | 3.533g Na2HPO4②③ |
0.025m磷酸氢二钠 | 9.18 | 1.179g KH2PO4②③ |
0.008695m磷酸二氢钾+ | 10.012 | 4.392g Na2HPO4 |
0.03043m磷酸氢二钠 | 3.80g Na2B4O7 lOH4o③ | |
0.01m硼砂 | 1.679 | 2.092g NaHCO3+ |
0.025m碳酸氢钠+ | 12.454 | 2.640g Na3CO3 |
0.025碳酸钠 | ||
辅助标准 | 12.61g KH2C4O82H2O④ | |
0.05四草酸钾 | 1.5gCa(OH)2① | |
氢氧化钙(25℃饱和) |
T/C | A | B | C | D | E |
0 | 4.003 | 6.984 | 7.534 | 9.464 | |
5 | 3.999 | 6.951 | 7.5 | 9.395 | |
10 | 3.998 | 6.923 | 7.472 | 9.332 | |
15 | 3.999 | 6.9 | 7.448 | 9.276 | |
20 | 3.56 | 4.002 | 6.881 | 7.429 | 9.225 |
25 | 3.55 | 4.008 | 6.865 | 7.413 | 9.18 |
30 | 3.55 | 4.015 | 6.853 | 7.4 | 9.139 |
35 | 3.55 | 4.024 | 6.844 | 7.389 | 9.102 |
38 | 3.55 | 4.03 | 6.84 | 7.384 | 9.081 |
40 | 3.55 | 4.035 | 6.838 | 7.38 | 9.068 |
45 | 3.54 | 4.047 | 6.834 | 7.373 | 9.038 |
50 | 3.55 | 4.06 | 6.833 | 7.367 | 9.011 |
55 | 3.56 | 4.075 | 6.834 | 8.985 | |
60 | 3.58 | 4.091 | 6.836 | 8.962 | |
70 | 3.61 | 4.126 | 6.845 | 8.921 | |
80 | 3.65 | 4.164 | 6.859 | 8.885 | |
90 | 3.67 | 4.205 | 6.877 | 8.85 | |
95 | 4.227 | 6.886 | 8.833 |
pH | 允许差(pH单位) | |
重复性* | 再现性* | |
<6 6—9 | ±0.1 | ±0.2 |
±0.1 | ±0.3 | |
>9 | ±0.2 | ±0.5 |