{"id":30050,"date":"2025-11-11T14:47:55","date_gmt":"2025-11-11T07:47:55","guid":{"rendered":"https:\/\/nhathuocngocanh.com\/bp\/?p=30050"},"modified":"2025-11-11T14:47:55","modified_gmt":"2025-11-11T07:47:55","slug":"sodium-carbonate-decahydrate","status":"publish","type":"post","link":"https:\/\/nhathuocngocanh.com\/bp\/sodium-carbonate-decahydrate\/","title":{"rendered":"Sodium Carbonate Decahydrate"},"content":{"rendered":"

(Ph. Eur. monograph 0191)<\/p>\n

Na_{2<\/sub>CO_{3<\/sub>,10H_{2<\/sub>O\u00a0 \u00a0 \u00a0 286.1\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 6132-02-1<\/p>\n}}}

DEFINITION<\/h2>\n

Content<\/h3>\n
36.7 per cent to 40.0 per cent of Na_{2<\/sub>CO_{3<\/sub>.<\/p>\n}}

CHARACTERS<\/h2>\n

Appearance<\/h3>\n
White or almost white, crystalline powder or colourless, transparent crystals, efflorescent.<\/p>\n

Solubility<\/h3>\n
Freely soluble in water, practically insoluble in ethanol (96 per cent).<\/p>\n

IDENTIFICATION<\/h2>\n
A. Dissolve 1 g in water R and dilute to 10 mL with the same solvent. The solution is strongly alkaline (2.2.4).<\/p>\n
B. The solution prepared for identification test A gives the reaction of carbonates (2.3.1).<\/p>\n
C. The solution prepared for identification test A gives reaction (a) of sodium (2.3.1).<\/p>\n

TESTS<\/h2>\n

Solution S<\/h3>\n
Dissolve 5.0 g in portions in a mixture of 5 mL of hydrochloric acid R and 25 mL of distilled water R. Heat the solution to boiling and cool. Add dilute sodium hydroxide solution R until the solution is neutral and dilute to 50 mL with distilled water R.<\/p>\n

Appearance of solution<\/h3>\n
The solution is clear (2.2.1) and not more intensely coloured than reference solution Y6 (2.2.2, Method I).<\/p>\n
Dissolve 4.0 g in 10 mL of water R.<\/p>\n

Alkali hydroxides and bicarbonates<\/h3>\n
Dissolve 1.0 g in 20 mL of water R, add 20 mL of barium chloride solution R1 and filter. To 10 mL of the filtrate add 0.1 mL of phenolphthalein solution R. The solution does not become red. Heat the remainder of the filtrate to boiling for 2 min. The solution remains clear (2.2.1).<\/p>\n

Chlorides (2.4.4)<\/h3>\n
Maximum 50 ppm.<\/p>\n
Dissolve 1.0 g in water R, add 4 mL of dilute nitric acid R and dilute to 15 mL with water R.<\/p>\n

Sulfates (2.4.13)<\/h3>\n
Maximum 100 ppm, determined on solution S.<\/p>\n

Iron (2.4.9)<\/h3>\n
Maximum 20 ppm.<\/p>\n
Dilute 5 mL of solution S to 10 mL with water R.<\/p>\n

ASSAY<\/h2>\n
Dissolve 1.000 g in 50 mL of carbon dioxide-free water R. Titrate with 1 M hydrochloric acid, determining the end-point potentiometrically (2.2.20). Read the volume added at the 2 point of inflection.<\/p>\n
1 mL of 1 M hydrochloric acid is equivalent to 52.99 mg of Na_{2<\/sub>CO_{3<\/sub>.<\/p>\n}}

STORAGE<\/h2>\n
In an airtight container.<\/p>\n","protected":false},"excerpt":{"rendered":"
(Ph. Eur. monograph 0191) Na2CO3,10H2O\u00a0 \u00a0 \u00a0 286.1\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 6132-02-1 DEFINITION Content 36.7 per cent to 40.0 per cent of Na2CO3. CHARACTERS Appearance White or almost white, crystalline powder or colourless, transparent crystals, efflorescent. Solubility Freely soluble in water, practically insoluble in ethanol (96 per cent). IDENTIFICATION A. Dissolve 1 g in…<\/p>\n","protected":false},"author":2,"featured_media":30062,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[174],"tags":[],"class_list":["post-30050","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-medicinal-substances"],"acf":[],"_links":{"self":[{"href":"https:\/\/nhathuocngocanh.com\/bp\/wp-json\/wp\/v2\/posts\/30050","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/nhathuocngocanh.com\/bp\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/nhathuocngocanh.com\/bp\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/nhathuocngocanh.com\/bp\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/nhathuocngocanh.com\/bp\/wp-json\/wp\/v2\/comments?post=30050"}],"version-history":[{"count":2,"href":"https:\/\/nhathuocngocanh.com\/bp\/wp-json\/wp\/v2\/posts\/30050\/revisions"}],"predecessor-version":[{"id":30064,"href":"https:\/\/nhathuocngocanh.com\/bp\/wp-json\/wp\/v2\/posts\/30050\/revisions\/30064"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/nhathuocngocanh.com\/bp\/wp-json\/wp\/v2\/media\/30062"}],"wp:attachment":[{"href":"https:\/\/nhathuocngocanh.com\/bp\/wp-json\/wp\/v2\/media?parent=30050"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/nhathuocngocanh.com\/bp\/wp-json\/wp\/v2\/categories?post=30050"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/nhathuocngocanh.com\/bp\/wp-json\/wp\/v2\/tags?post=30050"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}

DEFINITION<\/h2>\n

Content<\/h3>\n36.7 per cent to 40.0 per cent of Na2<\/sub>CO3<\/sub>.<\/p>\n

CHARACTERS<\/h2>\n

Appearance<\/h3>\nWhite or almost white, crystalline powder or colourless, transparent crystals, efflorescent.<\/p>\n

Solubility<\/h3>\nFreely soluble in water, practically insoluble in ethanol (96 per cent).<\/p>\n

TESTS<\/h2>\n

Solution S<\/h3>\nDissolve 5.0 g in portions in a mixture of 5 mL of hydrochloric acid R and 25 mL of distilled water R. Heat the solution to boiling and cool. Add dilute sodium hydroxide solution R until the solution is neutral and dilute to 50 mL with distilled water R.<\/p>\n

Appearance of solution<\/h3>\nThe solution is clear (2.2.1) and not more intensely coloured than reference solution Y6 (2.2.2, Method I).<\/p>\nDissolve 4.0 g in 10 mL of water R.<\/p>\n

Chlorides (2.4.4)<\/h3>\nMaximum 50 ppm.<\/p>\nDissolve 1.0 g in water R, add 4 mL of dilute nitric acid R and dilute to 15 mL with water R.<\/p>\n

Sulfates (2.4.13)<\/h3>\nMaximum 100 ppm, determined on solution S.<\/p>\n

Iron (2.4.9)<\/h3>\nMaximum 20 ppm.<\/p>\nDilute 5 mL of solution S to 10 mL with water R.<\/p>\n