15 Facts on H2SO4 + Ag2S: What, How To Balance & FAQs

Sulphuric acid (H2SO4) is a strong acid, and silver sulphide (Ag2S) is a dense black solid. Let’s study the various aspects of the H2SO4 + Ag2S reaction in detail.

Sulphuric acid is a corrosive liquid that is dense, colourless, and oily. It completely ionizes in water as it’s a strong acid. Silver sulphide is an inorganic compound which is the only sulphide of silver. It is helpful in photography as a photosensitizer.

In this article, we will focus on several characteristics of the H2SO4 + Ag2S reaction in depth.

What is the product of H2SO4 and Ag2S?

Ag2S reacts with H2SO4 to form H2S (hydrogen sulphide) and Ag2SO4 (silver sulphate).

Ag2S(s) + H2SO4(aq)  Ag2SO4(s) + H2S(s) 

What type of reaction is H2SO4+Ag2S?

H2SO4 and Ag2S belong to the category of double displacement reaction.

How to balance H2SO4+Ag2S?

  • The general equation of the H2SO4 + Ag2S reaction is as follows: Ag2S + H2SO4 → Ag2SO4 + H2S
  • The reaction is said to be balanced when the moles of reactant are equal to the moles of product.
  • The above reaction is already balanced. Hence, the balanced reaction is given by: Ag2S + H2SO4 → Ag2SO4 + H2S

H2SO4+Ag2S titration

H2SO4 + Ag2S can be titrated to determine the quantity of Ag. However, because the reaction produces a precipitate, it should be carried out carefully.

Apparatus used

Pipette, Erlenmeyer flask, burette holder, burette, wash bottle, dropper, volumetric flask and beakers.

Titre and titrant

In H2SO4 +Ag2S titration, H2SO4 is titrant, and the titre is AgNO3.


Phenolphthalein, an acid-base indicator, is employed to detect the end point of the titration.


  • A burette was used to take standardized H2SO4, and an Erlenmeyer flask was used to take AgNO3.
  • 1-2 drops of phenolphthalein indicator were added.
  • H2SOfrom the burette was added dropwise into the conical flask until the solution changed from colourless to light pink.
  • To obtain three concordant readings the process was repeated.

H2SO4 +Ag2S net ionic equation

The balanced net ionic equation of H2SO4+Ag2S is as follows:

Ag2S(s) + 2H+(aq) + SO42-(aq)  Ag2SO4(s) + H2S(s)

H2SO4 +Ag2S conjugate pairs

H2SO4 +Ag2S reaction don’t form conjugate pairs because they do not conjugate to produce the products.

H2SO4  and Ag2S intermolecular forces

H2SO4  and Ag2S have the following intermolecular forces,

 H2SO4 +Ag2S reaction enthalpy

The standard reaction enthalpy of the H2SO4 +Ag2S reaction is negative.

Is H2SO4 +Ag2S a buffer solution?

H2SO4 +Ag2S don’t form a buffer solution because of the strong acid H2SO4.

Is H2SO4 +Ag2S a complete reaction?

H2SO4 +Ag2S reaction is complete because hydrogen sulphide and silver sulphate are formed in the same amount and don’t undergo further reaction.

Is H2SO4 +Ag2S an exothermic or endothermic reaction?

The reaction between H2SO4 +Ag2S is an exothermic reaction and the heat released is used to complete the reaction.

Is H2SO4 +Ag2S a redox reaction?

Redox reaction doesn’t occur when H2SO4 +Ag2S react because the oxidation state of reactants and products remains the same.

Is H2SO4 + Ag2S a precipitation reaction?

H2SO4 + Ag2S is a precipitation reaction as it leads to the formation of precipitates like Ag2SO4 and H2S.

Is H2SO4 + Ag2S reversible or irreversible reaction?

The reaction between H2SO4 +Ag2S is irreversible as the reactants do not combine with products to reform them.

Is H2SO4 + Ag2S displacement reaction?

H2SO4 + Ag2S is a double displacement reaction cations and anions exchange their position resulting in the formation of a new product.


In conclusion, the reaction between H2SO4 + Ag2S has a high synthetic application and can be categorized as a double displacement and precipitation reaction with a negative enthalpy. The reaction is irreversible. Heat is liberated during the process.

Scroll to Top