The Surface Tension of Gelatin Solutions. (Part II.)

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Abstract
The "protein error" of certain indicators with gelatin solutions has been investigated. Bromophenol blue gives a minimum error at the isoelectric point and a maximum error about p H 2 [center dot] 4. The surface tension-p n curves of gelatin have been corrected as regards P h for the "protein error" in the colorimetric estimation of pH. The possibility of acid hydrolysis of gelatin in solutions acid to p h 2 [center dot] 0 has been investigated by means of formaldehyde titration. A certain amount of hydrolysis occurred on long standing, but there is no evidence of an immediate hydrolysis which would account for the sudden fall of surface tension below p H 2 [center dot] 0.

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