When Lead nitrate is heated it decomposes with a cracking sound, a reddish brown gas is liberated and a solid residue is left in the test tube. What is the pH range of the aqueous solution when the gas is dissolved in water?

Open in App

Solution

1. Decomposition reaction
In a decomposition reaction, the reactant compound is broken down into more than one smaller compound.
2. Heating of Lead nitrate
Lead nitrate undergoes a decomposition reaction to give a solid residue (PbO) and a reddish-brown gas $({NO}_{2})$ .
The reaction for the decomposition of Lead nitrate $[Pb {({NO}_{3})}_{2}]$ is given below.
$2 Pb {({NO}_{3})}_{2} (aq) \to 2 PbO (s) + 4 {NO}_{2} (g) + O_{2} (g) (Lead nitrate) (Lead oxide) (Nitrogen dioxide) (Oxygen)$
3. pH range
The different pH ranges for acidic, basic, and neutral solutions are as follows:
Acidic: 0 to 6
Basic: 8 to 14
Neutral 7

The gas obtained is Nitrogen dioxide $({NO}_{2})$ and when it is dissolved in an aqueous solution, the pH range of this solution will be between 0 to 6. This means that the solution is acidic in nature.

Suggest Corrections

Similar questions

Q. Identify the substances P, Q, and R in each case based on the information given below:
(i) The deliquescent salt P, turns yellow on dissolving in water, and gives a reddish brown precipitate with sodium hydroxide solution.
(ii) The white crystalline solid Q is soluble in water. It liberates a pungent smelling gas when heated with sodium hydroxide solution.
(iii) The pale green solid R turns reddish brown on heating. Its aqueous solution gives a white precipitate with barium chloride solution. The precipitate is insoluble in mineral acids.

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?

When Lead nitrate is heated it decomposes with a cracking sound, a reddish brown gas is liberated and a solid residue is left in the test tube. Write the name and formula of the gas.

When Lead nitrate is heated it decomposes with a cracking sound, a reddish brown gas is liberated and a solid residue is left in the test tube. Write the name and colour of the residue left.

When Lead nitrate is heated it decomposes with a cracking sound, a reddish brown gas is liberated and a solid residue is left in the test tube. Write the balanced chemical equation to describe the changes on decomposition of Lead nitrate.

Join BYJU'S Learning Program