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Name: Henry
Status: other
Age: old
Location: N/A
Country: N/A
Date: 2000


Question:
Wich chemical is used to make a pH7 buffer solution? How much is used to make up 1L? Also the same for pH4?


Replies:
Henry Formulas for the different pH values from 1 to 13 in differences of 0.1 pH units can be found in the Handbook of Chemistry and Physics, published by the Chemical Rubber Company and other chemical handbooks.

For pH=7.00 the composition of the buffer solution is: 50 ml 0.1 molar potassium dihydrogen phosphate and 29.1 ml of 0.1 molar NaOH.

For pH= 4.00 the composition of the buffer solution is: 50 ml of 0.1 molar potassium hydrogen phthalate and 0.1 ml of 0.1 molar NaOH.

Vince Calder



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