Nitric Acid 35% w/w

27th October 2018



An image showing Nitric Acid 35% w/w in a 5 litre container

Need Nitric Acid 35% w/w?

  • We supply nitric acid 35% w/w in 5L containers, with discounts available for bulk orders
  • Further information can be found on our Sales Product Specification, available to download from our website
  • Full MSDS is also available to download

How is Nitric Acid Synthesised Industrially?

In industrial processes, nitric acid (HNO3) can be produced in different manners:

Nitrogen Dioxide

Nitric acid is commonly synthesised by mixing nitrogen dioxide (NO2) and water (H2O), according to the reaction:

3 NO2 H2O → 2 HNO3 NO

The nitric oxide (NO) can be re-oxidised in the air to generate additional nitrogen dioxide which can then be used to synthesise nitric acid. From this process, solutions obtained are typically between 52 and 68% nitric acid.

Ostwald Process

In this case, ammonia (anhydrous) is converted to nitric oxide via an oxidation reaction, conducted in the presence of rhodium or platinum catalysts at high temperature (above 500 K) and pressure (9 bar):

4 NH3 (g) 5 O2 (g) → 4 NO (g) 6 H2O (g)

In a second step, nitric oxide (NO) is oxidised in air to produce nitrogen dioxide (NO2, reaction 1), and subsequently absorbed in water to finally synthesise nitric acid (reaction 2). The by-product nitric oxide (NO) can be recycled for re-oxidation.

Reaction 1: 2 NO (g) O2 (g) → 2 NO2 (g)

Reaction 2: 3 NO2 (g) H2O (l) → 2 HNO3 (aq) NO (g)

As an alternative, the final step can be done in the presence of oxygen:

4 NO2 (g) O2 (g) 2 H2O (l) → 4 HNO3 (aq)

Open an Account With Us

Are you a regular customer? If so, we offer the possibility to open an account with us to make your orders go smoother. If you wish to do so, simply contact our sales team on 0800 990 3258 or by email and a member of staff will be glad to help.


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