Question

Balance the chemical equation by including the physical states of the substances for the following reactions.
a.) Barium chloride and sodium sulphate aqueous solutions react to give insoluble Barium sulphate and an aqueous solution of sodium chloride.
b.) Sodium hydroxide reacts with hydrochloric acid to produce sodium chloride and water.
c.) Zinc pieces react with dilute hydrochloric acid to liberate hydrogen gas and form Zinc chloride.

Answer 1

A balanced chemical equation is the one in which the number of atoms for each element in the reaction and total charge is the same for both reactants and products. There are some steps to be followed to balance the equations.
Step 1 :- Identify the reactants and products.
Step 2 :- Write the equation for the reaction.
Step 3 :- Count the number of atoms of each element in the reactants and products.
Step 4 :- Balance the equation.

Complete Solution :
A balanced chemical equation is the one in which the number of atoms for each element in the reaction and total charge is the same for both reactants and products.
Let us write the reactions one by one and then balance them.

So, the first reaction is as -
a.) Barium chloride and sodium sulphate aqueous solutions react to give insoluble Barium sulphate and an aqueous solution of sodium chloride.
$BaC{l_2}(aq) + N{a_2}S{O_4}(aq) \to BaS{O_4}(s) + 2NaCl(aq)$

The second reaction is as -
b.) Sodium hydroxide reacts with hydrochloric acid to produce sodium chloride and water.
$NaOH(aq) + HCl(aq) \to NaCl(aq) + {H_2}O(l)$
The third reaction is as -

c.) Zinc pieces react with dilute hydrochloric acid to liberate hydrogen gas and form Zinc chloride.
$Zn(s) + 2HCl(aq) \to ZnC{l_2}(aq) + {H_2}(g)$

Note: The word insoluble means the molecule is in solid state and the aqueous means in a liquid state. Liberation means escaping out. Such a molecule is in the gaseous state that escapes out or liberates out. The molecules on the right side of the arrow are products and on the left side are reactants.