Nitric Acid

NITRIC ACID:

Commercially available HNO3 is an azeotrpe mixture with water. Mostly found in 68.0%. Nitric Acid is considered as strong acid.

CONTENTS:

63.0 %  m/m   to   70.0 %  m/m

Concentrated HNO3 is clear, colorless or almost colorless liquid, miscible with water

Having Density   =  1.384 g/cm3  to 1.416 g/cm3

A 10 g/L solution is strongly acid and give the reaction of nitrates

CHEMICAL STRUCTURE: 

Nitric Acid
Structure of Nitric Acid.

APPEARANCE:

Nitric acid is clear and not more intensely colored than reference solution

BOILING POINT:

120.5°C at 1 atm pressure

CHLORIDES:

Maximum 0.5ppm when 5 gram in 10 ml of water and 0.3 ml of silver nitrate and allowed to stand for 2 minutes protected from light any opalesense is not more intense than that of a standard prepared in the same manner using 13 ml of water, 0.5 ml of nitric acid, 0.5 ml of chloride solution and 0.3 ml of silver nitrate solution.

SILFATES:

maximum 2.0ppm

Evaporate 10.0 grams to dryness with 0.2 gram of sodium carbonate. Dissolve the Residue in 15 ml of distilled water. Prepare the standard using a mixture of 2 ml of sulphate standard solution and 13 ml of distilled water

ARSENIC:

Maximum 0.02ppm

Gently heat 50 grams with 0.5 ml of sulfuric acid until white fumes begin to evolve. To the Residue add 1 ml of a 100 g/L solution of hydroxylamine hydrochloride and dilute to 2 ml with water. Prepare the standard using 1.0 ml of arsenic standard solution

IRON:

Maximum 1.0 ppm

Dissolve the Residue from the determination of sulphated ash in 1 ml of dilute hydrochloric acid and dilute 250 ml with water and dilute 5ml of this solution to 10 ml with water

HEAVY METALS:

Maximum 2.0 ppm

Dilute 10 ml of the solution prepared for the limit test for iron to 20 ml with water. 12 ml of the solution complies with the test. Prepare the reference solution using Lead standard solution

SULFATED ASH:

Maximum 0.001%

Evaporate 100.0 grams to dryness moisten the residue with a few drops of sulfuric acid and heat to dull red.

ASSAY:

To 1.50 grams add about 50 ml of water and titrate with 1M Sodium Hydroxide using 0.1 ml of methyl red solution as indicator

1 ml of 1M Sodium Hydroxide solution is equivalent to 63.0mg of HNO3.

NITRIC ACID DILUTE:

(in dilute from it contains about 125g/L of HNO3)

Dilute 20 gram of HNO3 to 100 ml with distilled water

NITRIC ACID DILUTE R1:

Dilute 40 gram of HNO3 to 100 ml with water.

NITRIC ACID DILUTE R2:

Dilute 30 gram of HNO3 to 100 ml with water.

NITRIC ACID FUMING:

Fuming HNO3 contains 98.0% of HNO3 .It is clear, slightly yellowish liquid fuming on contact with air. Having density about 1.5 g/cm3. This grade is often used in explosive industry.

ANHYDROUS HNO3:

Anhydrous HNO3 contains 99.9% of HNO3. It contains maximum 2.0% of water and 0.5% of dissolved NO2. It is also known as White fuming nitric acid, pure nitric acid

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