Color Change Of Indicator Research Articles

(355)第一水銀塩によるハロゲン溶液の電位差滴定 (付: 吸着指示薬の変色について)

(355)第一水銀塩によるハロゲン溶液の電位差滴定 (付: 吸着指示薬の変色について)

A simple apparatus for rapid p H and other changes, requiring 200 cc or more of each reagent

A simple photoelectric arrangement is described for analysing the colour of the streaming fluid in various parts of the observation tube of a Hartridge-Roughton apparatus. The method has been applied especially to the colour changes of indicators, with the aid of which rapid H changes may be followed. Under favourable conditions an accuracy of 0-01-0.02 p H is reached, the distribution of the indicator between its two coloured forms being determinable to within about ± 1.0%.

Use of the photovoltaic cell in micro acidimetry

A method of acidimitry of strong acids and strong bases has been described which employs a light sensitive cell for following indicator color changes. 5 cc. of 0,007 N acid can be titrated to the equivalence point with an error of 1 part in 750.