Sulfonilic acid CAS# 121-57-3

Sulfonilic acid, Promotion Season Now in Store and Free Sample for Testing with Factory Price
  • Appearance: White or off-white powder.
  • Assay: 99. 0%min.
  • Packaging: 25kg/bag.
  • Sample: Available.

Quality Control of Sulfonilic acid

Chemical Structure
Packing of Sulfonilic acid

Description of Sulfonilic acid

Sulfanilic acid (4-aminobenzenesulfonic acid ) is an off-white crystalline solid which finds application in quantitative analysis of nitrate and nitrite ions. The solid acid exists as a zwitterion, and has an unusually high melting point.

Basic Info of Sulfonilic acid

Basic Info

Chemical Name

4-aminobenzenesulfonic acid


Sulfanilic Acid;4-Aminobenzenesulfonic acid,Aniline-4-sulfonic acid;4-Aminobenzenesulfonic acid,Aniline-4-sulfonic acid,Sulfanilic acid;4-Aminobenzenesulfonic acid,Sulfanilic acid;4-Aminobenzenesulfonic acid;Expand



Molecular Formula


Molecular Weight







Safety Info



Safety Statements


HS Code


WGK Germany



UN 2790 8/PG 3

Risk Statements

R36/38; R43

Hazard Codes




Signal Word


Caution Statement

P280; P305 + P351 + P338

Hazard Declaration

H315; H317; H319



Appearance & Physical State

light grey powder



Boiling Point


Melting Point

288ºC (dec)

Water Solubility

0.1 g/100 mL (20 ºC)


Stable. Incompatible with strong oxidizing agents.

Storage Condition

Store in dark


Numbering system

RTECS number


EINECS number


BRN number


MDL number



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What is Sulfonilic acid?

With the progress of science and technology and the development of society, chemical products have invariably permeated our daily lives, in medicine, food, cosmetics, electronics, industry, and other areas, becoming an essential part of our lives. One such product is Sulfonilic acid which has developed particularly rapidly in recent years. Do you know about Sulfonilic acid?


The official answer: The 4-Aniline sulfonic acid molecular formula is C6H7NO3S, is a white to off-white powder, in the air after absorbing moisture into white crystals, with a molecule of crystal water, temperature up to 100 ℃ to lose crystal water, at 300 ℃ began to decompose carbonization, slightly soluble in cold water, soluble in boiling water, insoluble in ethanol, ether and benzene, has obvious acidity, can be soluble in sodium hydroxide solution and sodium carbonate solution. It is used in the manufacture of azo dyes, etc. It can also be used as a pesticide for the prevention and control of wheat rust.

What’s the application of Sulfonilic acid?

  1. Used in the manufacture of azo dyes, etc., also used as a pesticide to prevent and control wheat rust.
  2. Mainly used in the manufacture of dyestuffs, printing and dyeing auxiliaries, and prevention of wheat rust and as intermediates for spices, food coloring, pharmaceuticals, whitening agents, pesticides, etc.
  3. Used in organic synthesis, also used as color layer analysis reagent, etc.
  4. Used as benchmark reagent, experimental reagent, and chromatographic analysis reagent.
  5. Reference reagent. Determination of aluminum, magnesium, potassium, sodium, iodine, iodide, and nitrite. Used with N-1-naphthyl ethylenediamine hydrochloride for the determination of nitrite, osmium, and ruthenium. Indirect determination of potassium by potassium nitrite. Determination of serum bilirubin, soil analysis. Also used to make printing and dyeing auxiliaries, pesticide fungicide, spices, food coloring, pharmaceutical building materials, and other fields.
  6. Used as analytical reagents, such as as a benchmark reagent for the determination of nitrite. Also used as a chromatographic reagent, and used in dye synthesis, pharmaceutical industry.


Sincere to the customer and in good faith of quality is our forever followed motto. It’s the basement to be a human and do business. We take all responsibility for our products and service sincerely. We are a company integrating R&D, production, and sales. The design, research, and development of pharmaceutical intermediates including more than 330 kinds of pharmaceutical intermediates such as Anti-infectives, Cardiovascular and Cerebrovascular Systems, Digestive System, Santi-tumor, Nervous System, Geriatric Drugs, and Gynecological Drugs. At the same time, we have more than 4,000 factories in strategic cooperation with nearly 50,000 chemical products, so we can provide you with a one-stop purchasing service, which greatly saves customers’ procurement costs and time.

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United Kingdom Giles
United Kingdom Giles
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Peter has been my partner for many years, we met at the Shanghai CPHI Fair in 2014, for the first time I didn't have much interest in Peter's products because our company had a stable supplier. Although we didn't work together, Peter would often send me important news and interesting trend information about the industry, so we became good friends, even though I didn't place any orders with him during this time, even if it was a sample order. In September 2016, our original supplier was unable to provide us with the quality and delivery guarantees we needed, so I first thought of Peter and his company. Until now, we have maintained a very good personal friendship in addition to a steady business relationship.
India Shikhar
India Shikhar
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In all my years of sourcing from China, I first time to found that working with Sincere Chemical was so good, they helped me with all the production and delivery as well as a lot of technical expertise, which saved me a lot of time. When I first approached Peter for a quotation for Optical Brightener, he made me a detailed quotation with not only prices but also foreign trade details, company profile, company strengths, R&D capabilities, production capacity, packaging methods, raw material control, environmental protection, and much more. This information was a very important reference for me in making purchasing decisions. Sincere Chemical is a trustworthy supplier and I believe our business will grow from strength to strength!
Korea Kim
Korea Kim
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Hi, I'm Kim, I'm Peter's partner and although I don't like him very much (because he never gives me more money for my prices, hahaha) I'm still willing to write him customer feedback. As an international buyer, I have to deal with a lot of things every day and my inbox is often full of development letters. It's a lot of junk and meaningless pleasantries, which I don't like that much, but Peter's emails always give me a better understanding of the product and the industry. I am also very pleased with his work ethic, and I am very happy with his work every time I work with him, not only in providing quotations but also in facilitating all the details of my work so that I can concentrate more on other things, so he is the best supplier for me. Although his prices are not the lowest among all suppliers, his products give me the greatest peace of mind.
USA Franklin
USA Franklin
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Sincere Chemical team visited our USA factory in the year of 2017. We think highly of cooperation with them. We thanked you for the past excellent orders and best product quality. We also talked about some new products for future orders. We will be still in strategic cooperation in the future and help each other.
Canada Kate
Canada Kate
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I just got the product. The quality is awesome. I’m very happy. Hope to place soon a new order in your company. Also wish for our future business.
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Sincere Chemical is a reliable and professional company. Not only on exporting but also their professional team service. Their team gave us so many suggestions for our new project. We are really satisfied with their awesome service and best product quality. Sincere-Chem’s vendor code is 51465768 in our cooperated vendor list system.
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I have visited Sincere Chemical company in the year 2018. Their company can be considered as one of the most professional, customer-focused, and product quality-driven companies that I have worked with in recent years.
Brazil Aline
Brazil Aline
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We are a pharmaceutical products manufacturer in Brazil. I’m happy to cooperate with Sincere Chemical especially cooperate with Peter. Peter is patient and friendly. I’m satisfied with his 24*7 hours service. We are not only cooperators but also best friends with each other.
Mexico Gonzalo
Mexico Gonzalo
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Great service and very supportive. This is my first order and I feel fortunate to be with Peter and his company. Product received was the right good quality product, so my review is more related with the quality, service and shipment. Thank you for sending. next time I will order again. Good supplier...