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OCR for page 47
47
Name: SODIUM HYDROXIDE, CAUSTIC SODA
CAS No.: 1310 - 72 - 2
Chemical Formula: NaOH
Description:
NAS/CWTC 0 21/82
Formula Weight: 40.1
Sodium hydroxide solutions are available in nominal con-
centrations of 50% sodium hydroxide and 73% sodium
hydroxide. m e solutions are clear or slightly turbid,
colorless or slightly colored, and when exposed to the
air they absorb carbon dioxide forming sodium carbonate.
The alkali equivalent of 100% sodium hydroxide is 77.5%
sodium oxide.
Use:
Used for pH adjustment.
Purity Requirements:
The RMIC are based on a maximum dosage of 100 mg of
sodium hydroxide/liter of water and are to be compared to
impurity concentrations obtained by using sample proce-
dures described in this monograph. If the actual dosage
is other than 100 mg/liter, the user is cautioned to
consult Table 2 for appropriate RMIC values.
ImPur its
Mercury
Bulk Sample Collection:
RMIC mg Impurity/kg
Sodium Hydroxide
2
Sample in accordance with Standard for Sodium Hydroxide,
AWWA B501-75, American Water Works Association, Denver,
Colorado (1975).
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Analytical Sample Preparation:
Weigh out 2.5 g of sodium hydroxide. In a 150-ml acid-
washed beaker, dissolve the sample with 100 ml of
deionized distilled water. Under a hood, acidify the
solution with concentrated HC1 to a pH of less than 2.
Add hydroxylamine hydrochloride until the solution turns
clear. Gently heat the solution to reduce the volume
below 100 ml, making certain that it does not boil.
Quantitively transfer to a 100-ml acid-washed volumetric
flask and make to volume with deionized distilled water.
Process a reagent blank by the same procedure.
Sample Analyses
~ :
The analyses are to be performed on the sodium hydroxide
solution in accordance with:
Standard Methods for the Examination of Water and Waste-
water, 15th Edition, American Public Health Association,
Washington, D.C. (1981).
Mercury
Section 303F
Representative terms from entire chapter:
quantitively transfer
