. Dairy laboratory guide. Dairying. TESTING ACIDITY OP MILK 21 Van Norman's Alkaline Test. Marshall's Acid Test. Mann's Acid Test Fill a 50 burette to zero mark with tenth normal solution of sodium hydroxide NaOH. Meas- ure 50 of milk or cream to be tested into a beaker. In the case of cream dilute with water, the amount depending upon the thickness of the cream. Add a few drops, two to five, of indicator; phenolph- thalein is generally used. Add the alkali solution to the cream very slowly, and stir constantly until a permanent pinkish color remains in the milk. The per cent of acid
. Dairy laboratory guide. Dairying. TESTING ACIDITY OP MILK 21 Van Norman's Alkaline Test. Marshall's Acid Test. Mann's Acid Test Fill a 50 burette to zero mark with tenth normal solution of sodium hydroxide NaOH. Meas- ure 50 of milk or cream to be tested into a beaker. In the case of cream dilute with water, the amount depending upon the thickness of the cream. Add a few drops, two to five, of indicator; phenolph- thalein is generally used. Add the alkali solution to the cream very slowly, and stir constantly until a permanent pinkish color remains in the milk. The per cent of acid is foimd by mul- tiplying the number of of alkali solution used by .009, dividing by the number of of milk or cream used and mul- tiplying the result by 100. The explanation of this formula is that the alkali of the sodium hydroxide neutralizes the acid Fig. 21. —Acid Bottle J. ,, .1, , !• , n with Burette or the milk. 1 of tenth nor- mal solution contains .004 of a gram of sodium hy- droxide which neutralizes .009 of a gram of lactic acid. This is obtained from the fact that a normal solution of lactic acid contains 90 grams of acid in each liter, or 1000 Example:. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Melick, Charles Wesley, 1877-. New York, D. Van Nostrand company
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