Question

when the following molecular equation is balanced using the smallest possible integer coefficients, the values of these coefficients are: hydrochloric acid (aq) + barium hydroxide (aq) → barium chloride (aq) + water (l)

Explanation:

Step1: Write the un - balanced chemical formula

The chemical formula for hydrochloric acid is \(HCl\), for barium hydroxide is \(Ba(OH)_2\), for barium chloride is \(BaCl_2\) and for water is \(H_2O\). So the un - balanced equation is \(HCl+Ba(OH)_2
ightarrow BaCl_2 + H_2O\).

Step2: Balance the chlorine atoms

There are 2 chlorine atoms on the right - hand side (\(BaCl_2\)) and 1 on the left - hand side (\(HCl\)). So we put a coefficient of 2 in front of \(HCl\). The equation becomes \(2HCl+Ba(OH)_2
ightarrow BaCl_2 + H_2O\).

Step3: Balance the hydrogen and oxygen atoms

On the left - hand side, we have \(2HCl\) (2 H atoms from \(HCl\)) and \(Ba(OH)_2\) (2 H and 2 O atoms). On the right - hand side, \(BaCl_2\) has no H or O, and \(H_2O\) has 2 H and 1 O. After putting a coefficient of 2 in front of \(H_2O\), the equation \(2HCl + Ba(OH)_2=BaCl_2+2H_2O\) is balanced.

Answer:

2, 1, 1, 2