Standard substances used for acid-base titration

For general information of what the standard substance is and what criteria it should meet, please read the standard substances page.

Remember to use analytical reagents (AR grade) for standards.

Borax Na2B4O7·10H2O - before weighting keep in a hygrostat over NaBr·2H2O. Equivalent weight is one-half the formula weight (381.3721 g).

Sodium carbonate Na2CO3 - heat for 1 hour at 270-300°C. Equivalent weight is one-half the formula weight (105.9884 g).

Potassium hydrogen phthalate (KHP, KHC8H4O4) - dry for 2 hours at 120° C. Equivalent weight is 204.2212 g.

Potassium hydrogen bis(iodate) KH(IO3)2 - dry at 110°C. Equivalent weight is 389.9116 g.

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