The oxidizables as carbon were determined by total wet reduction of potassium dichromate by the sample.The hydrolysis numbers are the milligrams of sodium hydroxide needed to neutralize the acid formed by hydrolysis of 1 gram of acid sample. These hydrolysis numbers could be calculated to percentage of alkyl sulfate. Known increments of water were analyzed as follows:The acid was analyzed for the original water content. Another sample of the acid was taken and a weighed amount of water was added after the ammonium chloride was mixed with the acid sample. The total water was determined and this value corrected for the amount of water originally present in the sample. The difference was taken as the water recovered.The total percentages contain water, actual sulfuric acid, butyl hydrogen sulfate, and oxidizables as carbon. The total percentages do not include the ash (normally 0.3 to 0.5%) or take into account the fact that some carbon is totaled twice, in both the butyl hydrogen sulfate and the oxidizables as carbon.• DISCUSSION No method of known accuracy and acceptable convenience was available for comparison with this method. The accuracy of the white acid analyses was indicated as within 0.1% absolute. The reproducibility was good on alkylation acids. The water recovered as compared to a known amount added was in close agreement.The range covered was from 98.5% to about 30% in a white acid; the black acid from 98% to about 85% titratable acidity as sulfuric acid. LITERATURE CITED