Question

balance HNO3 +Ca(OH)2=Ca(NO3)2 +H2O​

Answer 1

Given to balance the reaction :-

$HNO_3 +Ca(OH)_2 \rightarrow Ca(NO_3)_2 +H_2O$

Solution:-

Here they given to balance the reaction means the no.of atoms  in reactants and products must be same . So, thus they are not balanced we have to balance them . Firstly we find the number of atoms present in reactants and products .

In reactants,

$HNO_3 +Ca(OH)_2$

• Hydrogen - 3 atoms
• Nitrogen - 1 atom
• Oxygen - 5 atoms
• Calcium - 1 atom

In products ,

$Ca(NO_3)_2+H_2O$

• Calcium - 1 atom
• Nitrogen - 2 atoms
• Oxygen - 7 atoms
• Hydrogen - 2 atoms

By observing reactants and products ,

Calcium atoms are same and Hydrogen , Nitrogen , Oxygen need to be balance

If we balance the oxygen, hydrogen first automatically nitrogen also can be balanced by observing the equation we can say

If we add 2 moles in the reactants and products of HNO_3 and

H_2O

$2HNO_3 +Ca(OH)_2 \rightarrow Ca(NO_3)_2 +2H_2O$

Then the equation is balanced because number of atoms in reactants and products are same

Reactants :-

Hydrogen = 2+2

Hydrogen = 4atoms

Oxygen  = 6+ 2

Oxygen = 8 atoms

Calcium = 1 atom

Nitrogen = 2 atoms

Products :-

Hydrogen= 4

Oxygen = 6+2

Oxygen = 8 atoms

Calcium = 1 atom

Nitrogen = 2 atoms

Thus ,the equation is balanced .

This process of balancing the equation is called Hit and trail method .

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Balanced equation is :- $2HNO_3 +Ca(OH)_2 \rightarrow Ca(NO_3)_2 +2H_2O$