简介:Acidity and vitamin C in refreshing drinks are titrated successively to quantify each component.
(1) First, citric acid in the sample is titrated with sodium hydroxide using glass/reference combination
electrode.
CH2C简介:Acidity and vitamin C in refreshing drinks are titrated successively to quantify each component.
(1) First, citric acid in the sample is titrated with sodium hydroxide using glass/reference combination
electrode.
CH2COOH CH2COONa
C(OH)COOH + 3NaOH C(OH)COONa + 3H2O
CH2COOH CH2COONa
(2) When titration of citric acid is completed, acetic acid is added to acidify the sample. The indicator
electrode is switched to platinum electrode automatically and vitamin C is titrated with iodine.
+ I2 + 2HI
详细>