Calcium hydroxide has a basic property và can easily react with a strong acid like hydrochloric acid. Let us see the chemical behaviour of the reaction between HCl & Ca

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An aqueous solution of hydrogen chloride is hydrochloric acid (HCl), often called muriatic acid. Hydrochloric acid is highly soluble in water. Calcium hydroxide (Ca(OH)2) is a white solid at room temperature that is only slightly soluble in water. When Ca(OH)2 và HCl react, a weak base-strong acid reaction occurs.In this article, we shall discuss some of the properties of this reaction, lượt thích its product, type of reaction, enthalpy, & intermolecular forces, in detail.

What is the hàng hóa of HCL and CA(OH)2 ?

When calcium hydroxide Ca(OH)2 and hydrochloric acid (HCl) combine, calcium chloride (Ca
Cl2) & water are produced (H2O), when the reaction occurs, a colourless solution is produced after the white precipitate has dissolved.
Ca(OH)2 (s)+ 2HCl (aq) → Ca
Cl2 (aq) + 2H2O (l)

What type of reaction is HCL + CA(OH)2 ?

The reaction between hydrochloric acid (HCl) và calcium hydroxide Ca(OH)2 is an acid-base reaction. It can also be categorised as a neutralisation reaction since acid và alkali have reacted from salt and water. 

How lớn balance HCL + CA(OH)2 ?

Step 1: Writing the general equation

The general equation is Ca(OH)2 (s)+ HCl (aq) → Ca
Cl2 (aq) + H2O (l) 

Step 2: Arranging the similarity between the reactant và product

In the reaction, the number of moles of reactant must be equal to the number of moles of the product and the reaction have balanced moles.

Since the sản phẩm has 2 moles of Cl atom. 2 moles of HCl are added. On the reactant side, there are 2 moles of oxygen. Thus, 2 moles of H2O are added on the product side.

Step 3: Writing the balanced equation

After adding the required number of moles on the reactant và product side, the overall balanced reaction is given by:

Ca(OH)2 (s)+ 2HCl (aq) → Ca
Cl2 (aq) + H2O (l)

HCL + CA(OH)2 titration

An acid-base titration between calcium hydroxide và hydrochloric acid can be performed khổng lồ measure the amount of calcium. Various conditions and apparatus are used, which are explained below.

Apparatus used

Burette, pipette, conical flask, burette holder, wash bottle, dropper, volumetric flask và beakers.

Titer and titrant

Hydrochloric acid is used as the titrant & filled in the burette. The chemical compound will be analysed with calcium hydroxide as the titer was taken in a conical flask.


Phenolphthalein is an acid-base indicator used to lớn detect the end point of the titration.


Standardised HCl was taken in a burette, & the given calcium hydroxide was taken in a conical flask.Added 1-2 drops of phenolphthalein indicator.Added HCl from the burette slowly into the conical flask with constant swirling until the solution turned from colourless to light pink.Repeated the procedure to lớn get 3 concordant readings.

HCL + CA(OH)2 net ionic equation

Since the reaction between calcium hydroxide Ca(OH)2 & hydrochloric acid (HCl) is a neutralisation reaction, the net ionic reaction follows a neutralisation reaction which is as follows:H+ (aq) + OH– (aq) → H2O (l)

HCL + CA(OH)2 conjugate pairs

The conjugate pair of the reaction between hydrochloric acid & calcium hydroxide is as follows:

HCl + OH– → Cl– + H2O(Acid) (Base) (Base) (Acid) In this reaction, HCl và Cl – are conjugate acid-base pairs và OH– and H2O are another conjugate acid-base pair.

HCL và CA(OH)2 intermolecular forces

In HCl, dipole-dipole interactions và London dispersion intermolecular forces are the intermolecular forces that hold the hydrogen and chloride ions together.Ca(OH)2 is an ionic compound with strong electrostatic attraction forces between Ca2+ & OH– ions.

HCL + CA(OH)2 reaction enthalpy

The standard reaction enthalpy of the reaction between hydrochloric acid and calcium hydroxide is negative.

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Energy profile diagram for an exothermic reaction

Is HCL + CA(OH)2 a buffer solution ?

HCl + Ca(OH)2 pairs of solutes would not form a strong buffer solution since HCl is a strong acid, not a weak acid. The acid should be weak, so adding more acid does not significantly change the p

Is HCL + CA(OH)2 a complete reaction ?

The above reaction is incomplete since there is no product formation. We can only determine whether or not the reaction will be complete once we observe any product on the right-hand side.

Is HCL + CA(OH)2 an exothermic or endothermic reaction ?

The reaction between hydrochloric acid và calcium hydroxide is exothermic. Therefore, this heat will be a driving force lớn complete the reaction.

Is HCL + CA(OH)2 a redox reaction ?

HCl + Ca(OH)2  is not a redox reaction since there is no change in the oxidation state of reactants and products.

Is HCL + CA(OH)2 a precipitation reaction ?

HCl + Ca(OH)2  is not a precipitation reaction. HCl is an aqueous solution, whereas Ca(OH)2 is a white precipitate. When a reaction occurs, a colourless solution is produced after the white precipitate has dissolved.

Is HCL + CA(OH)2 reversible or irreversible reaction ?

The reaction between calcium hydroxide Ca(OH)2 and hydrochloric acid (HCl) is irreversible because the products formed don’t react together to reform reactants.

Is HCL + CA(OH)2 displacement reaction ?

The above reaction is a double displacement reaction because the cations & anions swap to create the water & the salt.Conclusion
This article summarises the reaction of HCl + Ca(OH)2 as a type of acid-base neutralisation reaction.

Calcium hydroxide (Ca(OH)2) reacts with hydrochloric acid (HCl) và form calcium chloride (Ca
Cl2) và water (H2O). This reaction is a weak base - strong acid reaction. Ca(OH)2 is a white precipitate and HCl is a aqueous solution. When reaction occurs, white precipitate is dissolved & colouress solution is given.

Reaction of Ca(OH)2 và HCl and balanced equation Reactants of reactions Products of reactions Change of oxidation numbers Physical & chemical properties changes during the reaction Health, safety measures of Ca(OH)2, HCl & Ca

Reaction of Ca(OH)2 và HCl and balanced equation

As mentioned earlier, calcium chloride & water are given as products. Because Calcium hydroxide's solubility is low in water, Ca(OH)2 partially dissociates lớn Ca2+ & OH- ions. Therefore there is very low OH- concentration in the aqueous solution which contains Ca(OH)2.But, HCl is readily soluble in water dissociates to H+ ions and Cl- ions & form a colourless solution.Now, there are H+ ions and OH- ions due lớn dissociation of Ca(OH)2 & HCl. So, now neutralization reaction takes place as figured below.

Balanced equation of Ca(OH)2 and HCl

Ca(OH)2(s) + 2HCl(aq) → Ca
Cl2(aq) + 2H2O(l)

According khổng lồ the balanced equation, one mole of Ca(OH)2 reacts with two mole of HCl và gives one mole of Ca
Cl2 & two moles of H2O respectively.


Explanation of dissolving of Ca(OH)2 by the concept of Equilibrium

Initially there are limited OH- concentration in the Ca(OH)2 solution. When HCl acid is added, hydroxyl ions received from Ca(OH)2 và H+ ions which are received from HCl react with each other. Then OH- concentration is reduced. According khổng lồ the Le'chatalier principle, khổng lồ keep the equilibrium, Ca(OH)2 is dissolved lớn release more OH- ions.

Reactants of the reaction: Ca(OH)2 & HCl

Calcium hydroxide (Ca(OH)2)

Calcium hydroxide is a trắng solid at room temperature & not much soluble in water. There is a very less amount of OH- concentration in a aqueous solution which contain Ca(OH)2 precipitate.

Hydrochloric acid (HCl)

Hydrochloric acid is a strong acid và highly soluble in water. It dissociates completely in water.

Products of the reaction: Ca
Cl2 and H2O

Calcium chloride (Ca

Calcium chloride is soluble in water and give a colourless aqueous solution.

Change of oxidation numbers

Oxidation numbers of atoms are not changed during the reaction. Therefore, this reaction is not a redox reaction.

Physical and chemical observation of Ca(OH)2 and HCl reaction

Here, we will see some physical observations và chemical properties changes during the reaction.

Colour and physical state changes

Because Ca(OH)2's solubility is low is water, you can see a deposited white solid at the bottom of the solution. HCl is a colourless solution. Ca
Cl2 is soluble in water & give a colourless aqueous solution.

Safety, health hazards & environmental impacts due to lớn Ca(OH)2, HCl, Ca

Ca(OH)2: Corrosive, irritant HCl: Corrosive, Acute toxic Ca
Cl2: Irritant


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