Market dairying and milk products . f alkali are required to neutralize 50 of cream ? 30 X .009 g^p— X 100 = M%. From the formula it is evident that any amount ofcream may be used for a test. But more accurate resultsare obtained by using 50 than less. Where thisamount of cream is always used the formula may be con-siderably simplified. Thus, by dividing the numerator and denominator by 50, the/ No. alkali X .009 \ expression ^ -^ X 100^ becomes (No. alkali X .009 X 2) or (No. alkali X .018). The acidity inthe problehi above would therefore equal 30 X .018 = M%. Harrin
Market dairying and milk products . f alkali are required to neutralize 50 of cream ? 30 X .009 g^p— X 100 = M%. From the formula it is evident that any amount ofcream may be used for a test. But more accurate resultsare obtained by using 50 than less. Where thisamount of cream is always used the formula may be con-siderably simplified. Thus, by dividing the numerator and denominator by 50, the/ No. alkali X .009 \ expression ^ -^ X 100^ becomes (No. alkali X .009 X 2) or (No. alkali X .018). The acidity inthe problehi above would therefore equal 30 X .018 = M%. Harringtons ai^kaunk tablet test. In the Farrington test the alkali is used as inManns, but in a dry tablet form in which it is more 86 MARKET DAIRVIXG easily handled than in the liquid form. Each tablet con-tains enough alkali to neutralize .034 gram of lactic Used for the Test. This is shown inI^ig- 33 arid consists of a porcelain cup, one , and a 100 rubber-stoppered graduated CrLJNDER. Fig. 33 —Farrington acid lest apparatus. Making the Solution. The solution is made in thegraduated cylinder by dissolving 5 tablets in enoughwater to make 97 solution. Wlien the tablets are dis-solved, which takes from six to twelve hours, the solutionshould be vsell shaken and is then ready for use. Thesolution of the tablets may be hastened by placing thegraduate in a reclining position as shown in the cut. Making the Test. With the pipette add ofcream to the cup, then with the same pipette add an equalamount of water. Now slowly add of the tablet solution, ACID TESTS 87 rotating the cup after each addition. As soon as a per-manent pink color appears, the graduate is read and thenumber of solution used will indicate the numberof hundredths of one per cent of acid in the cream. Thus,if it required 50 of the tablet solution to neutralize thecream then the amount of acid would be .50%. Fromthis it will be seen tha
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectdairyin, bookyear1913
