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

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Hydrogen Fluoride (HF) is an inorganic chemical compound that can be in gaseous and liquid forms. Calcium Chloride is a white powder. Let us discuss some reactions of HF + CaCl2.

HF is called Hydrogen Flouride in a gaseous state. Hydroflouric acid in a liquid form is colorless, highly toxic and corrosive as well. It is primarily used in industries only. CaCl2 is highly soluble with water and hygroscopic, is used in road surfacing as it can control the dust particles.

In the following section of the article, we are going to discuss the type of reaction, reaction enthalpy, net ionic reaction, how to balance, products, etc.

What is the product of HF and CaCl2

CaF2 (calcium fluoride) and HCl (hydrochloric acid ) are the products of the reaction HF + CaCl2.

HF + CaCl2 = CaF2 + 2HCl

What type of reaction is HF + CaCl2

HF + CaCl2 is a double displacement reaction .

How to balance HF + CaCl2

Following steps are used to balance the reaction HF + CaCl2.

2HF + CaCl2 = CaF2 + 2HCl

  • Name the reactant and products with alphabet A, B, C, and D
  • A HF + B CaCl2 = C CaF2 + D HCl
  • Modify the atoms with suitable numbers
  • H –> A, D,  F –> A, C,  Ca –> B, C, Cl –> B, D
  • Multiply the coefficients with suitable numbers
  • A = 2, B = 1, C = 1, D = 2
  • Reduce the lowest integer value
  • Thus, the final balanced equation is
  • 2HF + CaCl2 = CaF2 + 2HCl

HF + CaCl2 titration

HF can not be titrated with CaCl2 because both are inorganic compounds and form acid with salt as products due to which it is not possible to, calculate the strength and unknown concentration of the solution.

HF + CaCl2 net ionic equation

The net ionic reaction of HF + CaCl2 is –

H+ + F– + Ca+ + 2Cl– = Ca+ + F– + 2H+ + 2Cl–

Here are the steps to drive the net ionic equation.

  • Write the full reaction with their states.
  • HF (l) + CaCl2 (s) = CaF2 (s) + 2HCl (l)
  • Split the atoms, into ions.
  • Thus, the net ionic equation is-
  • H+ + F– + Ca+ + 2Cl– = Ca+ + F– + 2H+ + 2Cl–

HF + CaCl2 conjugate pairs

HF + CaCl2 has the following conjugate pairs (forms when protonation of acid and deprotonation of base takes place)-

  • The Conjugate pair for CaCl2 is HCl after the deprotonation of CaCl2.

HF and CaCl2 intermolecular forces

The intermolecular forces present in the reaction HF + CaCl2 are

  • Ionic bonds and polar bonds are the intermolecular forces of attraction present between CaCl2.

HF + CaCl2 reaction enthalpy

The reaction enthalpy is -956 KJ/mole for the reaction HF + CaCl2, where-

  • Enthalpy of formation of HF = -161KJ/mole
  • Enthalpy of formation of CaCl2 = – 795 KJ/mole
  • Thus, total enthalpy = Enthalpy of formation of HF  – Enthalpy of formation of CaCl2
  • = (-161KJ/mole) – (- 795 KJ/mole)
  • = -956 KJ/mole

Is HF + CaCl2 a buffer solution

 HF + CaCl2  can not be a buffer solution as the product CaF2 is an inorganic salt that always forms a neutral solution whereas, another product is HCl which is an acid and does not allow the pH to increase more than 7.

Is HF + CaCl2 a complete reaction

HF + CaCl2 is a complete reaction as the products are CaF2 and HCl which are the complete complexes of chemical compounds and cannot react further.

Is HF + CaCl2 an exothermic or endothermic reaction

HF + CaCl2 is an exothermic reaction because due to the bond dissociation, a large amount of heat is released by the reaction and the solution gets warmed up.

Is HF + CaCl2 a redox reaction

HF + CaCl2 is not a redox reaction as there is no loss or gain of hydrogen atoms and oxidation states are also the same throughout the reaction.

Is HF + CaCl2 a precipitation reaction

HF + CaCl2 is not a precipitation reaction as the product is CaF2 which is a salt with high solubility in an aqueous medium, due to which the solution does not allow the salt to precipitate after the reaction.

Is HF + CaCl2 reversible or irreversible reaction

HF + CaCl2 is an irreversible reaction as the reaction is complete and products CaF2 and HCl cannot be in the form of reactants again.

Is HF + CaCl2 displacement reaction

HF + CaCl2 is a double-displacement reaction as Ca+ displaces the H+ ion from HF and hydrogen ion also, displaces the Ca+ ion from CaCl2  and forms CaF2  ( calcium fluoride ) and HCl (hydrochloric acid).

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Conclusion

HF is used as a super acid in the petrochemical industry, and pharmaceuticals industries with polymer industries as well. Whereas, CaCl2 is used in the food industry as a food preservative and additive, and as a dehydrating agent in the petrochemical industry.