OPERATION MANUAL
7
5. Preparation of standard solution
Pour the standard solution powder into the 250ml beaker, use the distilled water to wash
it, and then dissolved and diluted to the scale, then shake up.
Below is the pH value and temperature relation table:
pH solution
Solution value name
Temp
℃
0.05mol/kg
potassium
hydrogen phthalate
0.025mol/kg
phosphate mixture
0.01mol/kg
borax
0
℃
4.01
6.98
9.46
5
℃
4.00
6.95
9.39
10
℃
4.00
6.92
9.33
15
℃
4.00
6.90
9.28
20
℃
4.00
6.88
9.23
25
℃
4.00
6.86
9.18
30
℃
4.01
6.85
9.14
35
℃
4.02
6.84
9.10
40
℃
4.03
6.84
9.07
45
℃
4.04
6.83
9.04
50
℃
4.06
6.83
9.02
55
℃
4.07
6.83
8.99
60
℃
4.09
6.84
8.97
70
℃
4.12
6.85
8.93
80
℃
4.16
6.86
8.89
90
℃
4.20
6.88
8.86
95
℃
4.22
6.89
8.84