Every chemical reaction has its own mechanism, and we need at least two elements for any single reaction. Let us explore a chemical reaction between HCl and CaCl2.
Hydrochloric acid when reacted with calcium chloride then the reaction follows a simple inorganic mechanism. Calcium chloride is basic salt so it can react with acids like hydrochloric. The reaction takes place at room temperature and standard pressure.
Although there will be some parameters and limitations are present in this reaction. Now we can discuss more about the mechanism of the reaction like enthalpy, redox reaction, intermolecular force, conjugate pairs etc with an explanation in the following article.
1. What is the product of HCl and CaCl2?
When hydrochloric acid is reacted with calcium chloride the chloride hydrochloride is formed as major product along with elemental calcium.
CaCl2 + 2HCl = 2HCl2 + Ca
2. What type of reaction is HCl + CaCl2?
The reaction between HCl + CaCl2 is a displacement reaction along with some redox and acid-buffer reaction is also involved. The Ca element are displaced from its chloride salt and chlorine is oxidized here.
3. How to balance HCl + CaCl2?
We can see CaCl2 + HCl = HCl2 + Ca reaction is not balanced as L.H.S. and R.H.S. have not same number of molecules, let us balance this equation in the following way,
- Step 1- Each individual molecules are labelled as A, B, C, and D as four elements are present.
- A CaCl2 + B HCl = C HCl2 + D Ca
- Step 2 – Now we using the equation by the suitable number which are the coefficient of reactants as well as products.
- Ca = A = D, Cl = 2A + B = 2C, H = B = C
- Step 3- all the variable and coefficients are calculated by the Gauss elimination method and we get,
- A = 1, B = 2, C = 2, and D =1
- So, overall balanced equation will be, CaCl2 + 2HCl = 2HCl2 + Ca
4. HCl + CaCl2 titration
In the titration reaction of the hydrochloric acid versus calcium chloride, we can follow several conditions, reagents, and apparatus which are discussed below,
Apparatus used
Burette, pipette, conical flask, burette holder, volumetric flask, and two beakers.
Titre and titrant
In this titration, we use hydrochloric acid as titrant filled in the burette and the molecule will be analyzed as calcium chloride as titer was taken in a conical flask.
Indicator
We use methyl orange (which is green in basic pH and violate in acidic pH) or phenolphthalein (which is pink in basic pH and colorless in acidic medium).
Procedure
The burette is filled with standardized hydrochloric acid and calcium chloride is taken in a conical flask. We Start the reaction from the burette by dropwise addition of acid and at the endpoint when the indicator changes its color then the titration will be done and calcium will get free.
Repeat the same process atleast for three to get correct result and not down the value to a notebook and then calculation with the formula V1S1 = V2S2 to find the volume of calcium.
5. HCl + CaCl2 net ionic equation
The net ionic equation of the HCl + CaCl2 is the formation of chloride ion along with hydrochloride acid. The acid will be ionized as proton and chloride ion, and calcium chloride salt will be ionized as Ca2+ and Cl– which can be shown below,
H+ + Cl– + Ca2+ + 2Cl– = Cl– + H+ + Cl– + 2Ca
6. HCl + CaCl2 conjugate pairs
The conjugate pair of the reaction between HCl + CaCl2 is the conjugate base hydrochloric acid and the respective conjugate acid of the salt, which is shown below,
HCl + CaCl2 = Cl– + HCaCl+2
7. HCl and CaCl2 intermolecular forces
The intermolecular force between hydrochloric acid is the ionic interaction between proton and chloride ion and for the calcium chloride is a dication of calcium and two chloride ion. When product is formed then one chloride is attached to acid by ionic interaction by its negative charge and hydrogen force.
8. Is HCl + CaCl2 a buffer solution?
The reaction of HCl + CaCl2 gives us acidic buffer in aqueous solution as former is acid and latter is basic salt.
9. Is HCl + CaCl2 a complete reaction?
The above reaction HCl + CaCl2 is not a complete reaction as there is no product at the right hand side.There must be one or more products as shown below for complete reaction.
CaCl2 + 2HCl = 2HCl2 + Ca
10. Is HCl + CaCl2 an exothermic or endothermic reaction?
The reaction between HCl + CaCl2 is exothermic reaction which mean it releases heat in the form energy when above two elements are reacting. This heat is utilized and served in the driving force for the completion of the reaction.
11. HCl + CaCl2 reaction enthalpy
The standard reaction enthalpy of the reaction between HCl + CaCl2 is negative as per thermodynamic first law. Mathematically, δH = Hproducts-Hreactans < 0. On other hand total bond energy of products – total bond energy of reactants is always less than 1.
Exothermic Reactions
12. Is HCl + CaCl2 a redox reaction?
The reaction between HCl + CaCl2 is a redox reaction because calcium is reduced here by donating electrons and chloride is oxidized to getting electrons. Actually, oxidation number of Ca get decreased and for chlorine increased.
13. Is HCl + CaCl2 a precipitation reaction?
The above reaction HCl + CaCl2 is a precipitation reaction as in the reaction between calcium chloride and hydrochloric acid their calcium will precipitate after the reaction.
14. Is HCl + CaCl2 reversible or irreversible reaction?
The above reaction between HCl + CaCl2 is the irreversible reaction because after the calcium gets free from salt it cannot react to acid and salt.
15. Is HCl + CaCl2 displacement reaction?
The above reaction of HCl + CaCl2 is a displacement reaction because when hydrochloric acid is reacted with calcium chloride then the acid simply displaces the calcium from its salt, and calcium gets free.
Conclusion
Calcium chloride is a basic salt and is titrated with strong acid like hydrochloric acid using indication methyl orange at respective pH. The reaction is exothermic so no need to provide any heat or pressure.
Read more about Facts on HCl + FeCl2, Facts on HCl + Al(OH)3 and Facts on HCl + Al2O3.
Hi……I am Biswarup Chandra Dey, I have completed my Master’s in Chemistry from the Central University of Punjab. My area of specialization is Inorganic Chemistry. Chemistry is not all about reading line by line and memorizing, it is a concept to understand in an easy way and here I am sharing with you the concept about chemistry which I learn because knowledge is worth to share it.
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