al+ hno3

HNO3 is colourless inorganic mineral acid is good oxidizing agents, undergo redox reaction with aluminium. Let us see, how reaction proceed.

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Aluminium is post transition element with atomic no. 13, show common oxidation state +3 possess covalency to tát khuông bond with varied elements. HNO3 reacts with AL to tát khuông corresponding nitrates by undergoing oxidation reduction reaction.

In this article, we will learn what will happened? When acid reacts with metal, along with its conjugate pairs and net ionic equation

What is product of HNO3 + AL

HNO3 + AL reacts to tát khuông aluminium nitrate, along with the evolution of hydrogen gas.

HNO3 + AL → AL(NO3)3 + H2

What type of reaction is HNO3 + AL

HNO3 + AL is single displacement (substitution) reaction. Displacement of AL by HNO3 is taking place in this reaction.

How to tát balance HNO3 + AL

The balanced reaction for HNO3 + AL is

6 HNO3 + 2 AL → 2 AL(NO3)3 + 3 H2

Here, are the following steps for balancing the reaction:

  • The given reaction, that we need to tát balance is:
  • HNO3 + AL → AL(NO3)3 + H2
  • We have to tát represent each molecule with alphabetical terms.
  • A HNO3 + B AL → C AL(NO3)3 + D H2
  • To construct an equation for each of the elements (H, N, O and AL).
  • In which each term denotes the number of atoms of element present in the reactant and the product side.
Sr No.ElementsABCD
No. of elements in reactant and product
  • Enter the coefficient values in guassian elimination reaction. We have to tát take smallest whole number integer value after simplifying it.
  • A = 6, B= 2, C= 2, D= 3
  • Entering the values in alphabetical place, we will get the balanced reaction as:
  • 6 HNO3 + 2 AL → 2 AL(NO3)3 + 3 H2.

HNO3 + AL titration

HNO3 + AL vì thế not show titration. Nitric acid has strong acidic nature along with good oxidizing agent oxidizes aluminium resulting in inaccurate result in titration with aluminium. However, it does not give redox reaction too, because of absence of base in the reaction.

HNO3 + AL net ionic equation

Net ionic equation for given reaction arrives as

2 AL(S) + 6 H+(Aq) → 2 AL+3 (Aq) + 3 H2(g)

  • We have to tát label each compound phases in balanced reaction equation.
  • 2 AL (S) + 6 HNO3 (Aq) → 2 AL(NO3)3 (Aq) + 3H2 (g)
  • Strong electrolytes will undergo complete ionization into ions.
  • Here HNO3 and AL(NO3)3 is strong electrolyte, which gets dissociated.
  • 2 AL(S) + 6 H+(Aq) + 6 NO3 (Aq) → 2 AL+3 (Aq) + 6 NO3(Aq) + 3 H2(g).
  • Remove the spectator ions NO3-, because it is present on both reactant and product side.
  • 2 AL(S) + 6 H+(Aq) → 2 AL+3 (Aq) + 3 H2(g).

HNO3 + AL conjugate pairs

Conjugate pairs involve in the reaction are:

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  • HNO3 release H+ to tát give NO3 as conjugate base.
  • Al being metal vì thế not have any conjugate pairs.
  • H2 accept proton to tát give H3O+ conjugate acid.

HNO3 + AL intermolecular forces

HNO3 + AL constitute following intermolecular forces, as follows:

  • HNO3 show hydrogen bonding, London forces and dipole-dipole interaction due to tát polarity in its molecule because of presence of electronegative differences in its molecule.
  • Aluminium has metallic bond forces of attraction due to tát không tính tiền movements of electrons in its metallic atom.
  • AL(NO3)3 have strong electrostatic intermolecular forces due to tát its ionic nature.
  • H2 show weak London dispersion forces because of unequally distribution of electron in hydrogen atom.

HNO3 + AL reaction enthalpy

HNO3 + AL have following reaction enthalpies:

  • HNO3 have enthalpy of formation -173 KJ/Mol.
  • Al has enthalpy of formation 0 KJ/Mol.
  • H2O have enthalpy of formation – 285 KJ/Mol.

HNO3 + AL a buffer solution

HNO3 + AL is not buffer solution because nitric acid is strong acid and buffer solution consist of weak acid and its conjugate base.

Is HNO3 + AL a complete reaction

HNO3 + AL is complete reaction because of formation of white crystalline precipitate of AL(NO3)3.

Is HNO3 + AL an exothermic or endothermic reaction

HNO3 + AL is exothermic reaction because all acid + metal reaction is taking place with evolution of heat, due to tát following reaction.

  • In this reaction HNO3 + AL → AL(NO3)3 + H2.
  • H and N bonds are broken in HNO3 molecule, while AL and HNO3 reacts to tát khuông bond and H-H bonds are formed.
  • Heat has been released due to tát formation of more bonds than vãn the breaking of bonds.
Exothermic reaction

Is HNO3 + AL a redox reaction

HNO3 + AL is redox reaction. Here oxidation and reduction will take place by hydrogen and aluminium.

Sr no.ElementsReactantProduct
Oxidation state of element on reactant and product side.
  • Here, H will undergo reduction by gaining 6 electrons and changing its state from +1 to tát 0.
  • Al will undergo oxidation by changing its state from 0 to tát +3 by loss of 3 electrons.

Is HNO3 + AL a precipitation reaction

HNO3 + AL is precipitation reaction because of formation of AL(NO3)3 salt precipitate.

Is HNO3 + AL is reversible or irreversible

HNO3 + AL is irreversible in nature because of strong acidic behavior of nitric acid to tát get completely dissociated, leaving no trace ions in solution. This makes reaction not to tát revert back.

Is HNO3 + AL a displacement reaction

HNO3 + AL is single displacement reaction. Substitution of AL by nitric acid will take place in this reaction, giving distinct product with by products.


HNO3 + AL gives irreversible redox reaction to tát khuông salt with evolution of hydrogen gas. In this reaction salt aluminium nitrate is good oxidizing agents used for insulation of paper, refining of petroleum and good nitrating agents in many reactions. Heat is released during breaking and forming of bonds.

Read more about following HNO3:

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HNO3 + Br2
HNO3 + Ba(OH)2
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HNO3 + Al2S3
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HNO3 + BaF2
HNO3 + Al(OH)3
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