how to balance equation in partial method - Chemistry -

Question

how to balance equation in partial method

Anuradha Puri · Accepted Answer

Partial equation method- The steps involved in this method are:

The given reaction is divided into two or more reactions which are
called partial equations

Each partial equation is balanced by hit and trial method

The intermediate species are cancelled out by multiplying the
partial equations by suitable numbers

Finally all partial equations are added to get the final balanced
equation

Example: Balance by partial method: NaOH + Cl2
â†’ NaCl + NaClO3 +H2O

1) split the given equation into
partial equations as follows:

i) NaOH + Cl2 â†’ NaCl + NaClO +
H2O

ii) NaOCl â†’ NaCl +
NaClO3

Balance the equations by hit and trial method:
i) 2NaOH + Cl2 â†’ NaCl + NaClO +
H2O
ii) 3NaOCl â†’ 2NaCl +
NaClO3

To cancel intermediate NaClO the partial balanced eqn i) is
multiplied by 3 and the two equations are added to get the overall
balanced equation

(2 NaOH + Cl2â†’ NaCl + NaClO +
H2O ) x 3
3NaOCl â†’ 2NaCl +
NaClO3

The overall balanced equation:

6NaOH + 3 Cl2â†’5NaCl +
NaClO3 + 3H2O