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Standard XII

Chemistry

Stoichiometric Calculations

The stoichiom...

Question

The stoichiometric coefficient of $N O_{3}^{⊖}$ in the balanced chemical reaction, when copper reacts with nitric acid, a brown gas is formed and solution turns blue, will be :
$C u + N O_{3}^{⊖} ⟶ N O_{2} + {C u}^{2 +}$

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Solution

In the reaction, Cu changes its oxidation number from 0 to +2. The net change in the oxidation number is 2.
N changes its oxidation number from +5 to +4. The net change in the oxidation number is 1.
Hence, to balance the net increase in the oxidation number of Cu with net decrease in the oxidation number of N, the nitrate ion and $N O_{2}$ is multiplied with coefficient 2.
$C u + 2 N O_{3}^{⊖} ⟶ 2 N O_{2} + {C u}^{2 +}$
The balanced chemical equation is as follows:
$C u + 2 N O_{3}^{⊖} + 4 H^{+} ⟶ 2 N O_{2} + {C u}^{2 +} + 2 H_{2} O$

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Similar questions

Q. Copper reduces

N O_{3}^{-}

into

N O

and

N O_{2}

depending upon concentration of

H N O_{3}

in solution. Assuming

[C u^{2 +}] = 0.1 M

, and

P_{N O} = P_{N O_{2}} = 10^{- 3}

bar. At which concentration of

H N O_{3}

, thermodynamic tendency for reduction of

N O_{3}^{-}

into

N O

and

N O_{2}

by copper is same?
[Given:

E_{C u^{2 +} | C u}^{\circ} = + 0.34 V, E_{N O_{3}^{-} | N O}^{\circ} = + 0.96 V, E_{N O_{3}^{-} | N O_{2}}^{\circ} = + .79 V

Q. Consider the following unbalanced reaction that is occurring in acidic solution:

C r_{2} O_{7}^{2 -} + N O_{2}^{-} \to C r^{3 +} + N O_{3}^{-}

When the reaction is balanced, what is the coefficient on the nitrate ion?

Q. When the following redox reaction

C u (a q) + N O_{3}^{-} (a q) \to C u^{2 +} (a q) + N O_{2} (g)

is balanced by oxidation number method in acidic meduim, the stoichiometric ratio

\frac{n_{N O_{2}}}{n_{H_{2} O}}

will be :

Question 39

On heating blue coloured powder of copper (II) nitrate in a boiling tube, copper oxide (black), oxygen gas and a brown gas X is formed

(a) Write a balanced chemical equation of the reaction.
(b) Identity the brown gas X evolved.
(c) Identity the type of reaction.
(d) What could be the pH range of aqueous solution of the gas X?

Question 39
On heating blue-colored powder of copper (II) nitrate in a boiling tube, copper oxide (black), oxygen gas, and a brown gas X are formed

(a) Write a balanced chemical equation of the reaction.
(b) Identity the brown gas X evolved.
(c) Identity the type of reaction.
(d) What could be the pH range of the aqueous solution of the gas X?

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The stoichiometric coefficient of NO⊖3 in the balanced chemical reaction, when copper reacts with nitric acid, a brown gas is formed and solution turns blue, will be : Cu+NO⊖3⟶NO2+Cu2+

The stoichiometric coefficient of $N O_{3}^{⊖}$ in the balanced chemical reaction, when copper reacts with nitric acid, a brown gas is formed and solution turns blue, will be :
$C u + N O_{3}^{⊖} ⟶ N O_{2} + {C u}^{2 +}$