H acid

4-inch-5-hydroxy - 2, 7-naphthalenedisulfonic acid Basic Information (Basic Information)

Formula: C10H9O7NS2

Molecular Weight: 319

CAS No. : 90-20-0

Quality indicators (Specification)

Appearance: the dilute solution is blue and red

Content (Purity) : excellent

Physical Properties

(1) in 20 ℃ water solubility was 0.17% (2) in 60 ℃ water solubility was 2.40% (3) c is not dissolved in alcohol and ether (4) soluble in alkali, sodium carbonate and ammonia solution 5) H acid dilute solution was blue red fluorescence (6) a.H acid can not only in the acidic coupled b. can also be coupled (7) in the alkaline a.H acid alkali soluble note in air quickly darkened;B. with nitric acid to produce the yellow crystalline diazo compounds;C. Nitrogen compounds dissolve in soda and alkaline solutions;D. dissolved in a light purple in a soda solution;It is dark green in an alkaline solution.

Storeage

Store in cool, ventilated and dry place, prevent sunshine and rain.

Use (Useage)

It is used to make a variety of azo dyes, used for dyeing wool, textiles, paper and cotton, as well as synthetic agents