Question

How do you balance the equation $Al+HCl\to AlC{{l}_{3}}+{{H}_{2}}$?

Answer 1

Hint: The general concept of the chemistry which tells about how to balance a chemical equation includes the concept which says that the number of moles of each atom in the reactant side should equal to that in the product side. Balance the above equation and you will get the required answer.

Complete answer:
From the chapters of general chemistry, we have come across the concept of balancing the given chemical equation and also about how to interpret it.
We shall now recall the concept so that we can derive the required answer.
- A chemical equation is the interpretation of the substances which reacts together to form a new or modified substance.
- The compounds which react with each other are called reactants and the compounds which are newly formed are called as the products.
- The reactants are written on the left hand side of the reaction and products on the right hand side of the equation which is separated by an arrow that represents the reaction going from hand right to left hand side.
- Balancing of this chemical equation is nothing but making the number of moles of each atom on the reactant side to be equal to that of the product side.
- In the above given reaction, $Al+HCl\to AlC{{l}_{3}}+{{H}_{2}}$ let us balance the number of moles on each side of the arrow mark.
- To completely balance we have to add 3 to aluminium on reactant side and add 6 to the hydrochloric acid so that the product changes as shown,
$2Al+6HCl\to 2AlC{{l}_{3}}+3{{H}_{2}}\uparrow $
Therefore, the above equation is the balanced chemical equation.

Note:
While you are balancing the equation, try to equalise on both the reactant as well as product side accordingly in all the possible ways and not just by looking into the product side and assigning the number because this leads to more confusion.