Determination of Ph Value in Water - Glass Electrode Method - Table 1 Preparation of pH Standard Solution

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Standard solution

(mass of solute, mol/kg⁻¹)

pH at 25℃

Required drug weight per 1000ml 25℃ aqueous solution

Basic Standards

Potassium hydrogen tartrate (saturated at 25℃)

0.05m potassium dihydrogen phosphate

0.05m potassium hydrogen phthalate

0.025m potassium dihydrogen phosphate+

0.025m disodium hydrogen phosphate

0.008695m potassium dihydrogen phosphate+

0.03043m disodium hydrogen phosphate

0.01m borax

0.025m sodium bicarbonate+

0.025m sodium carbonate

Auxiliary Standards

0.05m potassium tetraoxalate

Calcium hydroxide (saturated at 25℃)

3.557

3.776

4.028

6.865

7.413

9.180

10.012

1.679

12.454

6.4g KHC₄H₄O₈①

11.4g KH₂C₆H₅o₇

10.1g KHC₈H₄o₄

3.388g KH₂Po₄+

3.533g Na₂HPO₄②③

1.179g KH₂PO₄②③

4.392g Na₂HPO₄

3.80g Na₂B₄O₇ lOH₄o③

2.092g NaHCO₃+

2.640g Na₃CO₃

12.61g KH₂C₄O₈2H₂O④

1.5gCa(OH)₂①

Note:

① Approximate solubility;

② Dry at 110-130℃ for 2-3 hours;

③ Must be prepared with freshly boiled and cooled distilled water (CO2-free).

④ Also known as potassium trihydrogen oxalate, dry at 54±3℃ for 4-5 hours before use.

References

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