Write The Balanced Chemical Equation When Hydrochloric Acid Reacts With Zinc Hydroxide?


The reaction between HCl and Zinc hydroxide is a reaction between a strong acid và a weak base. Let us see the mechanism behind the reaction between HCl & Zn(OH)2.

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When strong acids lượt thích HCl react with the weak base like zinc hydroxide then weak salt is formed by hydrolysis. The reaction does not require any type of catalyst, because the nature of HCl is so strong that it can be ionized and carry forward the reaction. The reaction also not required temperature & pressure.By this reaction, we can estimate the strength of the HCl or the amount of chloride present in the given molecule. In this article, we will learn more about reactions lượt thích enthalpy, redox reaction, intermolecular force, conjugate pairs, etc with an explanation in the following part of the article.

1. What is the product of HCl và Zn(OH)2?

Zinc chloride formed as a major product when HCl reacted with Zn(OH)2 along with water molecules due khổng lồ hydrolysis.

2. What type of reaction is HCl + Zn(OH)2?

HCl + Zn(OH)2 is an acid-base & hydrolysis reaction. There are also redox reactions, displacement reactions, & also precipitation reactions that occur at certain pH. The former is strongly acidic but the latter is weakly basic so, a buffer reaction is also observed.

3. How khổng lồ balance HCl + Zn(OH)2?

HCl + Zn(OH)2 = ZnCl2 + H2O this reaction is not balanced yet because the L.H.S of the reaction is not equal lớn the R.H.S., so we have to lớn balance the equation in a few steps,

Step 1 – Labelling all the reactants & products by the required number of alphabetsFirst, we labeled all the molecules in the part of the reactant as well as the sản phẩm side by A, B, C, & D as there is a total of four molecules present in both sites in unbalanced form. Now the reaction reduces to,  A HCl + B Zn(OH)2= C ZnCl2 + D H2OStep 2 – Equating all the Coefficients for all the same type of elements by rearranging themComparing all the same elements by their stoichiometric proportion and coefficients in this reaction we get,H = A = 2D, Cl = A = 2C, Zn = B = C, OH = 2B = 2DStep 3 – Using Gaussian elimination lớn determine the coefficient valuesUsing the Gaussian elimination and equating all the equations we get,A = 2, B = 1, C = 1, D = 2Step 4- now write the whole equation in the balanced formThe overall balanced equation will be,2HCl + Zn(OH)2= ZnCl2 + 2H2O

4. HCl + Zn(OH)2 titration

To estimate the quantity of chloride & strength of HCl we can perform a titration between Zn(OH) 2 and HCl in the following way,

Apparatus used

We need a burette, conical flask, burette holder, volumetric flask, & beakers for this titration.

Titre & titrant

HCl versus Zn(OH)2, HCl acts as titrant which is taken in the burette and the molecule to lớn be analyzed is Zn(OH)2which is taken in a conical flask.


The whole titration is done in an acidic medium or acidic pH so the best suitable indicator will be phenolphthalein which gives perfect results for this titration at given pH.


The burette was filled with standardized HCl & Zn(OH) 2 was taken in a conical flask along with the respective indicator. Then the titration was started by adding HCl dropwise to lớn the conical flask and the flask was shaking constantly. After a certain time when the endpoint arrived and the indicator changes its color.We repeat the titration several times for better results & then we estimate the quantity of chloride và strength of HCl by the formula V1S1 = V2S2.

5. HCl+ Zn(OH)2 net ionic equation

The net ionic equation between HCl+ Zn(OH)2 is,2H+ + 2Cl– + Zn2+ + 2OH– = Zn2+ + 2Cl– + 2H+ + 2OH–

6. HCl+ Zn(OH)2 conjugate pairs

The conjugate pairs formed during the reaction between HCl + Zn(OH)2 are,Conjugate pair of HCl = ClConjugate pair of H2O = OH–

7. HCl và Zn(OH)2 intermolecular forces

The ionic and electrostatic forces are present in HCl as also dipole interaction and for the Zn(OH)2. There are coulombic forces along with covalent interaction present with the molecule. Strong H-bonding is present in H2O and for ZnCl2 there is ionic interaction along with van der waal’s interaction present.

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MoleculeActing forceHClElectrostatic,van der Waals,anddipoleInteractionZn(OH)2Coulombic ionic,van der waal’sZnCl2Ionic, StrongelectrostaticH2OThe electrostatic force,H-bonding
Intermolecular Forces

8. HCl + Zn(OH)2 reaction enthalpy

The reaction enthalpy between HCl + Zn(OH)2 is, -86.4 KJ/mol which can be obtained by the formula enthalpy of products – enthalpy of reactants, và here the change in enthalpy is negative.MoleculeEnthalpy(KJ/mol)Zn(OH)2-642HCl-92.3ZnCl2-415H2O-249
Reaction Enthaply

9. Is HCl + Zn(OH)2 a buffer solution?

The reaction between HCl + Zn(OH)2 gives a buffer solution of ZnCl2 and water which can control the pH of the solution as it has both acidic as well as basic characteristics at certain pH.

10. Is HCl + Zn(OH)2 a complete reaction?

HCl + Zn(OH)2 is a complete reaction that gives two complete products ZnCl2 and H2O which indicates that reactants are utilized properly and ends with two complete products.

11. Is HCl + Zn(OH)2 an exothermic or enothermic reaction?

HCl + Zn(OH)2 is an exothermic reaction based on thermodynamics because the enthalpy for the reaction came negative. On the other hand, the reactant released heat in the course of the reaction or we can say δH = HProducts-Hreactans 

12. Is HCl + Zn(OH)2 a redox reaction?

HCl + Zn(OH)2 is a redox reaction where the oxidation number of several elements is changed lượt thích Cl gets reduced whereas O và H get oxidized.

13. Is HCl + Zn(OH)2 a precipitation reaction

HCl + Zn(OH)2 is a precipitation reaction where ZnCl2 is precipitated at the acidic pH. The optimum pH for the precipitation of ZnCl2 is 6.6 and the total titration was done in an acidic medium so ZnCl2 precipitated in this reaction.

14. Is HCl + Zn(OH)2 reversible or irreversible reaction?

HCl + Zn(OH)2 is irreversible reaction because that reaction proceeds only forward direction at that particular pH.

15. Is HCl + Zn(OH)2 displacement reaction?

HCl + Zn(OH)2 is a double displacement reaction because Zn is displaced by HCl & Cl is also displaced by Zn(OH)2.ConclusionTo estimate the quantity of Cl– we can use the titration between Zn(OH)2 and HCl. By this reaction, we also estimate the strength of HCl as well. The reaction does not require any catalyst or temperature because it is an endothermic reaction.
Biswarup Chandra DeyHi......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 & memorizing, it is a concept lớn understand in an easy way & here I am sharing with you the concept about chemistry which I learn because knowledge is worth to tóm tắt it.

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