O-S-801F
TABLE III. Sampling for sulfuric acid, electrolyte tests.
Number of contai |
ners to to to ver 3 |
in batch or lot |
Number of sample containers |
2 51 501 O |
50 500 35,000 5,000 |
2 3 5 8 |
4.2.3 Inspection procedures for sulfuric acid, electrolyte tests. Each sample specimen taken in
4.2.2 shall be tested as specified in 4.3.5. Failure of any test by any specimen shall be cause for rejection of the lot represented.
4.3 Test methods.
4.3.1 Sulfuric acid, electrolyte tests. See 6.5 for sampling and testing precautions. The water shall be in accordance with ASTM D 1193 and reagent grade chemicals shall be used throughout the tests. Where applicable, blank determinations shall be run and corrections applied where significant. Unless otherwise specified, acid and base reagents shall be concentrated acids and bases. Tests shall be conducted as follows:
4.3.2 Material. Visually examine the specimen for evidence of fuming and for presence of sediment.
4.3.3 Color. Compare the color of 50 ml of the specimen in a Nessler tube with that of 50 ml of a standard contained in a second, matching Nessler tube. Prepare the standard using 0.12 mg of copper, 1 ml of 0.1 N hydrochloric acid, and 50 ml of freshly prepared hydrogen sulfide water. Dilute to 50 ml for class 1 comparison, 120 ml for class 2 comparison, 180 ml for class 3 comparison, or 260 ml for class 4 comparison. Make the comparison vertically through the solution immediately after the preparation of the standard. The matching Nessler tubes should have a capacity of 50 ml and approximately dimensions of 30 cm in length by 2 cm in diameter.
4.3.4 Acid content. By means of a weighing buret, weighing bottle, or Dely tube, transfer an accurately weighed amount of the specimen, equivalent to 0.8 to 1.1 g of 100 percent sulfuric acid, into a porcelain casserole dish containing 100 to 150 ml of carbon-dioxide free water. Add
1 ml of phenolphthalein indicator (1 g in 50 ml ethyl alcohol and 50 ml water) and titrate to a faint permanent pink color with standard 0.5 N sodium hydroxide solution. Record the volume and temperature of 0.5 N sodium hydroxide solution (titer) used. Correct the volume of the titer by adding 0.00035 ml per milliliter of titer for each degree C that the sodium hydroxide solution is below the temperature of standardization. Calculate the percent by weight sulfuric acid as follows:
Percent sulfuric acid = 4.904AB W
where: A = Correct milliliter of sodium hydroxide solution used in the titration, B = Normality of the sodium hydroxide solution, and
W = Weight of specimen in grams.
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