15 Facts on H2SO4 + CaCl2: What, How To Balance & FAQs

The reaction between H₂SO₄ and CaCl₂ is a reaction that takes place in a boiling solution. Let us discuss this deeply.

H₂SO₄ is a very strong acid that is a major constituent in oil of vitriol and is an oxidant that acts as a dehydrating agent and helps manufacture lots of fertilizers. CaCl₂ is a white-colored powder which is crystalline in nature. CaCl₂ is also hygroscopic and helps in road surfacing. 

With the help of a completely balanced chemical equation of both reactants, a few facts will be discussed in the article below.

What is the product of H₂SO₄ and CaCl₂

CaSO₄(Calcium Sulphate) and HCl (Hydrochloric Acid) are the products which are formed by the reaction of H₂SO₄ and CaCl₂ .

H₂SO₄ +CaCl₂→CaSO₄+HCl

What type of reaction is H₂SO₄ + CaCl₂

The reaction of H₂SO₄ and CaCl₂ is a double displacement reaction as a mutual exchange of ions takes place.

How to balance H₂SO₄ + CaCl₂

The equation is balanced using the following steps:

H₂SO₄ +CaCl₂→CaSO₄+HCl

• Write the different elements present in the reaction. 

• Write the number of atoms of each element on both sides ( reactant and product side)

• Equalise the number of atoms on both sides.

• The balanced chemical equation is,
• H₂SO₄ +CaCl₂→CaSO₄+2HCl

H₂SO₄ +CaCl₂ titration

The titration of H₂SO₄ + CaCl₂ is not possible because the product formed, CaSO₄ is insoluble.

H₂SO₄ + CaCl₂ net ionic equation

The net ionic equation for H₂SO₄ + CaCl₂ is

Ca²⁺(aq) +SO₄^2-(aq)→ CaSO₄ (s).

The net ionic equation is deduced using the following steps:

• Write the balanced chemical equation.

• H₂SO₄+CaCl₂→CaSO₄+2HCl

• Write the physical state of each compound along with them.

• H₂SO₄(aq) +CaCl₂(aq)→CaSO₄(s)+HCl(aq)

• Dissociate the strong electrolytes into their respective ions.

• H₂SO₄→ 2H ⁺+ SO₄^2-

• CaCl₂→Ca²⁺+2Cl^–

• 2HCl→2H⁺ +2Cl^–

• Remove the spectator ions.

• Ca²⁺(aq) +SO₄^2-(aq)→ CaSO₄ (s)

• Thus the net ionic equation is-
• Ca²⁺(aq) +SO₄^2-(aq)→ CaSO₄ (s).

H₂SO₄ + CaCl₂ conjugate pairs

• H₂SO₄ has conjugate base pair H₂SO₄^– as it is a strong acid.
• CaCl₂ does not have any conjugate pair as it is a salt.

H₂SO₄ and CaCl₂ intermolecular forces

• CaCl₂ forms an ionic bond by donating two electrons to chlorine atoms from Calcium atoms.

• H₂SO₄ has van der Waals dispersion forces, dipole-dipole interactions and hydrogen bonding as intermolecular forces.

H₂SO₄ + CaCl₂ reaction enthalpy

The reaction enthalpy of H₂SO₄ + CaCl₂ is -0.0499 kJ which is very high.

Is H₂SO₄ +CaCl₂ a buffer solution

H₂SO₄ +CaCl₂ is not a buffer solution because H₂SO₄ is a strong acid whereas a buffer solution always contains a weak acid and its conjugate base or a weak base and its conjugate acid.

Is H₂SO₄ + CaCl₂ a complete reaction

H₂SO₄ + CaCl₂ is a complete reaction because two products exchange their ions to form two different products. 

Is H₂SO₄ + CaCl₂ an exothermic or endothermic reaction

H₂SO₄ + CaCl₂ is highly exothermic in nature because ΣΔH°f(reactants) > ΣΔH°f(products), hence a lot of heat energy is released.

Is H₂SO₄ +CaCl₂ a redox reaction

H₂SO₄ + CaCl₂ is not a redox reaction, as oxidation states do not change during the reaction. 

Is H₂SO₄ + CaCl₂ a precipitation reaction

H₂SO₄ + CaCl₂ is a precipitation reaction because the product formed- CaSO₄ (Calcium Sulphate) is white colored precipitate.

Is H₂SO₄ + CaCl₂ reversible or irreversible reaction

H₂SO₄ + CaCl₂ is an irreversible reaction because the products formed do not go back to the reactant state. 

Is H₂SO₄ + CaCl₂ displacement reaction

H₂SO₄ + CaCl₂ is a single displacement reaction precisely because one highly reactive metal- Ca displaces the less reactive element-hydrogen in this reaction.

Conclusion

The products formed, CaSO₄ is usually found in gypsum form, and the chemical formula of gypsum is CaSO₄.2H₂O. It occurs naturally in nature, whereas HCl, also known as muriatic acid, is a very strong acid and has a pungent smell.