Product standards and uses of sodium m-nitrobenzene sulfonate

7.
Laboratory preparation method

Three-necked flask was added 104g 98% sulfuric acid and containing 68g% SO 20 is _.
3 of fuming sulfuric acid
.

8.
Product Standard

9.
Quality inspection

Content determination: Weigh about 2.
2g of the sample (weigh to 0.
0002g) in a 500mL Erlenmeyer flask, add 100mL of water, after dissolution, correct the temperature to 20℃, add 30mL of hydrochloric acid, add 7g of zinc powder in batches under stirring
.

Where: V ₁ ——The volume of sodium nitrite standard solution consumed by the sample, mL;

V ₂ ——The volume of sodium nitrite standard solution used in blank, mL;

c——The molar concentration of sodium nitrate standard solution, mol/L;

G——The mass of the sample, g
.

10.
Product use

This product is a mild oxidant, used as a dyeing aid
.

11.
Safety measures

(1) The raw material benzene is toxic and flammable, and nitric acid, concentrated sulfuric acid, and fuming sulfuric acid are highly corrosive.
The equipment should be closed, the operators should wear labor protection equipment, and the workshop should be well ventilated
.

(2) Packed in chemical fiber board barrel lined with plastic bag, stored in a cool, ventilated and dry place, storage period is two years
.