适用于酸度在每千克2 mol到200 mol单价酸之间的产品。给出了两种程序:一种适用于液体产品（R11、R113等），另一种适用于气体产品（R12、R22等）。其原理是用水萃取酸。以溴甲酚绿为指示剂，用标准体积氢氧化钠溶液滴定水相中的酸。图示为常温下气体产品吸收酸的装置。

Applicable to products the acidity of which is between 2 mol and 200 mol of univalent acid per kg. Two procedures are given: one is applicable to liquid products (R11, R113, etc.) and the other one to gaseous (R12, R22, etc.). The principle consists in extraction of the acids by water. Titration of the acids in the aqueous phase with standard volumetric sodium hydroxide solution in the presence of bromocresol green as indicator. A figure shows an apparatus for absorption of acids for products which are gaseous at ordinary temperatures.