Zn +NaOH +NaNo3 -------- Na2ZnO2 +NH3 +H2O balance the equation - Science - Atoms and Molecules

Question

Zn +NaOH +NaNo3 -------- Na2ZnO2 +NH3 +H2O balance the equation

Vartika Jain · Accepted Answer

Solution:
The chemical equation is

Zn + NaNO3 + NaOH = Na2ZnO2 + NH3 + H2O

Zn is oxidized to Zn(+2) and N(+5) in NO3 is reduced to N(-3) in
NH3 However the oxidation state of sodium remains the same on both
sides Therefore, zinc is reducing agent while NO3- is oxidizing
agent in reaction and the changes are shown as:

0 +1 +5 +1 2(+1)(+2) (-3)

Zn + NaNO3 + NaOH = Na2ZnO2 + NH3 + H2O

The increase/decrease in oxidation number ration of Zn to NO3- is
1:4 Hence, balance by multiplying NO3- by 1 and Zn by 4 We get,

4 Zn + NaNO3 + NaOH = 4 Na2ZnO2 + NH3 + H2O

Now look at the sodium atoms it is 8 on product side, hence to
balance it we need to add 7 to NaOH as we should not disturb NO3
with Na (i e NaNO3) on reactant side Then the equation becomes,

4 Zn + NaNO3 + 7 NaOH = 4 Na2ZnO2 + NH3 + H2O

All other atoms except hydrogen and oxygen are balanced Now check
the equation to balance H and O They are also balanced Hence the
balanced equation is:

4 Zn + NaNO3 + 7 NaOH = 4 Na2ZnO2 + NH3 + 2 H2O