ANSI IT4.104-2002 pdf download Processing Chemicals – Specifications for Hydrochloric Acid
1 Scope
This standard establishes criteria for the purity of photographic-grade hydrochloric acid (DANGER:<>, <>) 1 ) and specifies the tests to be used to determine the purity.
2 Normative references
The following standards contain provisions which, through reference in this text, constitute provisions of this standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid standards.
ISO 1 0349-1 :1 992, Photography – Photographic-grade chemicals – Test methods – Part 1: General
ISO 1 0349-4:1 992 (R1 999), Photography – Photographic-grade chemicals – Test methods – Part 4: Determination of residue after ignition
ISO 1 0349-5:1 992 (R1 999), Photography – Photographic-grade chemicals – Test methods – Part 5: Determination of heavy metals and iron content
3 General
3.1 Physical properties
Hydrochloric acid, HCl, is a solution of hydrogen chloride gas in water. It is a colorless or slightly yellow liquid with an extremely pungent odor.
Anhydrous hydrochloric acid (hydrogen chloride) has a relative molecular mass of 36.46.
3.2 Hazardous properties
Hydrochloric acid causes severe skin burns on contact.
3.3 Storage
Hydrochloric acid shall be stored in well-closed containers away from combustible materials.
4 Requirements
A summary of the requirements is shown in Table 1 .
5 Reagents and glassware All reagents, materials, and glassware shall conform with the requirements specified in ISO 1 0349-1 unless otherwise noted. The hazard warning symbols, used as a reminder in those steps detailing handling operations, are defined in ISO 1 0349-1 . These symbols are used to provide information to the user and are not meant to provide conformance with hazardous labeling requirements, as these vary from country to country.
6 Sampling
See ISO 1 0349-1 .
7 Test methods
7.1 Assay
7.1.1 Specification
The minimum mass fraction of hydrochloric acid shall be 35.0%; the maximum mass fraction shall be 38.0%.
7.1.2 Reagents
7.1.2.1 Methanol, CH 3 OH
7.1.2.2 Methyl red indicator
Dissolve 0.1 g of methyl red in 1 00 ml of methanol (7.1 .2.1 ).
7.1.2.3 Sodium hydroxide, NaOH, (DANGER: <>), standard volumetric solution of 1 mol/l (40 g/l).