Question

Write a balanced chemical equation for each of the following neutralization reactions.H2SO4 + Ca(OH)2 ->HCl + NaOH ->

Answer 1

The neutralization reactions give as products a salt and water.

For the first reaction, the resulting salt will be CaSO4 and for the second NaCl reaction, the reactions obtained are the following:

`H_2SO_4+Ca(OH_)_2\rightarrow CaSO_4+H_2O`
`HCl+NaOH\rightarrow NaCl+H_2O`

We must count the atoms of each element on both sides of each reaction to check that they are balanced.

For the reaction between H2SO4 and Ca(OH)2 we have:

Reactants side:

H=4atoms

S=1 atoms

O=6atoms

Ca=1 atom

Products side:

H=2atoms

S=1 atoms

O=5atoms

Ca=1 atom

We must balance the hydrogen and oxygen, we place the coefficient two in the water molecule and we will have the equation of the balanced reaction.

`H_2SO_4+Ca(OH)_2\rightarrow CaSO_4+2H_2O`

On both sides of the reaction we have:

H=4atoms

S=1 atoms

O=6atoms

Ca=1 atom

For the second reaction, the number of atoms on each side of the reaction is:

H=2atoms

Cl=1atom

Na=1atom

O=1 atom

This equation is already balanced

In summary, we have that the balanced chemical equation for the reactions is:

H2SO4 (aq) + Ca(OH)2 (s) → CaSO4 (s) + 2 H2O (l)

NaOH (aq) + HCl (aq) → NaCl (aq) + H2O (l)