平凡人回复于2010/12/21
pH | 0.2mol/L NaH2PO4(ml) | 0.2mol/L Na2HPO4(ml) |
5.7 | 93.5 | 6.5 |
5.8 | 92.0 | 8.0 |
5.9 | 90.0 | 10.0 |
6.0 | 87.7 | 12.3 |
6.1 | 85.0 | 15.0 |
6.2 | 81.5 | 18.5 |
6.3 | 77.5 | 22.5 |
6.4 | 73.5 | 26.5 |
6.5 | 68.5 | 31.5 |
6.6 | 62.5 | 37.5 |
6.7 | 56.5 | 43.5 |
6.8 | 51.0 | 49.0 |
6.9 | 45.0 | 55.0 |
7.0 | 39.0 | 61.0 |
7.1 | 33.0 | 67.0 |
7.2 | 28.0 | 72.0 |
7.3 | 23.0 | 67.0 |
7.4 | 19.0 | 81.0 |
7.5 | 16.0 | 84.0 |
7.6 | 13.0 | 87.0 |
7.7 | 10.5 | 89.5 |
7.8 | 8.5 | 91.5 |
7.9 | 7.0 | 93.0 |
8.0 | 5.3 | 94.7 |
〓猪哥哥〓回复于2010/12/31
磷酸盐无法达到8以上,要到9的话,需要用0.2M甘氨酸和0.1M NaOH溶液按照体积比25:4.4制备
xing-xing回复于2010/12/31
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)
4.92 0.10 9.90
5.29 0.50 9.50
5.91 1.00 9.00
6.24 2.00 8.00
6.47 3.00 7.00
6.64 4.00 6.00
6.81 5.00 5.00
6.98 6.00 4.00
7.17 7.00 3.00
7.38 8.00 2.00
7.73 9.00 1.00
8.04 9.50 0.50
8.34 9.75 0.25
8.67 9.90 0.1
8.18 10.00 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。
常用的磷酸盐缓冲溶液pH值在8以下。配到9就失去了缓冲溶液的意义,
同意
yuzengsheng回复于2011/01/11
ph=8.0 0.1M磷酸二氢钠溶液:0.1M磷酸氢二钠溶液=53:947
pH | 0.2mol/L NaH2PO4(ml) | 0.2mol/L Na2HPO4(ml) |
5.7 | 93.5 | 6.5 |
5.8 | 92.0 | 8.0 |
5.9 | 90.0 | 10.0 |
6.0 | 87.7 | 12.3 |
6.1 | 85.0 | 15.0 |
6.2 | 81.5 | 18.5 |
6.3 | 77.5 | 22.5 |
6.4 | 73.5 | 26.5 |
6.5 | 68.5 | 31.5 |
6.6 | 62.5 | 37.5 |
6.7 | 56.5 | 43.5 |
6.8 | 51.0 | 49.0 |
6.9 | 45.0 | 55.0 |
7.0 | 39.0 | 61.0 |
7.1 | 33.0 | 67.0 |
7.2 | 28.0 | 72.0 |
7.3 | 23.0 | 67.0 |
7.4 | 19.0 | 81.0 |
7.5 | 16.0 | 84.0 |
7.6 | 13.0 | 87.0 |
7.7 | 10.5 | 89.5 |
7.8 | 8.5 | 91.5 |
7.9 | 7.0 | 93.0 |
8.0 | 5.3 | 94.7 |