Standard No.:	GB/T 639-2008
English Name:	Chemical reagent - Sodium carbonate anhydrous
Chinese Name:	化学试剂 无水碳酸钠
Professional Classification:	GB    National Standard
Issued by:	AQSIQ; SAC
Issued on:	2008-5-15
Implemented on:	2008-11-1
Status:	valid
Superseding:	GB/T 639-1986 化学试剂 无水碳酸钠
Language:	English
File Format:	PDF
Word Count:	6000 words
Price(USD):	150.0
Delivery:	via email in 1 business day

Molecular formula: Na2CO3 Relative molecular mass: 105.99 (according to the international relative atomic mass in 2005). 1 Scope This standard specifies the characteristics, specifications, tests, inspection rules, packaging and marking of sodium carbonate anhydrous in chemical reagents. This standard is applicable to the inspection of sodium carbonate anhydrous in chemical reagents. 2 Normative references The following documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments (excluding corrections), or revisions, of any of these publications do not apply to this standard. However, parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. For undated references, the latest edition of the normative document referred to applies. GB/T 601 Chemical reagent - Preparations of reference titration solutions GB/T 602 Chemical reagent - Preparations of standard solutions for impurity (GB/T 602-2002, ISO 6353-1: 1982, NEQ) GB/T 603 Chemical reagent - Preparations of reagent solutions for use in test methods (GB/T 603-2002, ISO 6353-1: 1982, NEQ) GB/T 609 Chemical reagent - General method for the determination of total nitrogen (GB/T 609-2006, ISO 6353-1: 1982) GB/T 6682 Water for analytical laboratory use - Specification and test methods (GB/T 6682-2008, ISO 3696: 1987, MOD) GB/T 9723-2007 Chemical reagent - General rule for flame atomic absorption spectrometric analysis GB/T 9728 Chemical reagent - General method for the determination of sulphate (GB/T 9728-2007, ISO 6353-1: 1982, NEQ) GB/T 9729 Chemical reagent - General method for the determination of chloride (GB/T 9729-2007, ISO 6353-1: 1982, NEQ) GB/T 9734-2008 Chemical reagent - General method for the determination of aluminum (ISO 6353-1: 1982, NEQ) GB/T 9738 Chemical reagent - General method for the determination of water insoluble matter (GB/T 9738-2008, ISO 6353-1: 1982, NEQ) GB/T 9739 Chemical reagent - General method for the determination of iron (GB/T 9739-2006, ISO 6353-1: 1982, NEQ) GB 15346 Chemical reagent - Packaging and marking HG/T 3484 Chemical reagent - standard of clear liquor, made from glass dust, and standard of transparence HG/T 3921 Chemical reagent - Regulations for sampling and acceptance 3 Characteristics The reagent is a kind of white powder, which gradually absorbs water into monohydrate when exposed to air, and is soluble in water while insoluble in ethanol. 4 Specifications See Table 1 for the specifications of sodium carbonate anhydrous.

Foreword i 1 Scope 2 Normative references 3 Characteristics 4 Specifications 5 Tests 6 Inspection rules 7 Packaging and marking