Salt Analysis 11th Chemistry Practical - Lead Nitrate

Summary

This video discusses the chemical experiment involving lead nitrate. It explains the two-part structure of salts—basic radical and acid radical. Using lead nitrate as an example, the video walks through a practical demonstration where lead nitrate is tested with copper turnings and concentrated sulfuric acid. The experiment is heated, producing reddish-brown vapors, confirming the presence of nitrate. The video further describes how to detect lead by preparing an original solution with potassium iodide, forming a yellow precipitate that confirms the presence of lead.

Takeaways

• 🧪 Lead Nitrate is composed of two parts: the basic radical (lead) and the acid radical (nitrate).
• 🔬 In every salt, there are typically two components: a basic radical and an acid radical.
• 🧴 For the experiment, Lead Nitrate is placed in a test tube, followed by the addition of copper turnings.
• ⚗️ Concentrated sulfuric acid is added to the mixture in small amounts (3-4 drops) to avoid complications during heating.
• 🔥 The test tube is heated, and the formation of reddish-brown vapors confirms the presence of nitrate.
• 🧪 The video demonstrates another test called the 'brown ring test,' which will be covered in a subsequent video.
• 🔍 To identify the basic radical (lead), an original solution must be prepared by dissolving the salt in water.
• 💧 If the salt does not dissolve completely, adding nitric acid can help. However, Lead Nitrate dissolves easily in water.
• ⚛️ After preparing the original solution, adding potassium iodide results in a yellow precipitate, confirming the presence of lead.
• 🧑‍🔬 The experiment verifies both the acid radical (nitrate) and the basic radical (lead) in Lead Nitrate.

Q & A

What is the first part of lead nitrate referred to in the script?

The first part of lead nitrate is referred to as the 'basic radical,' which in this case is lead.

What is the second part of lead nitrate, and how is it classified?

The second part of lead nitrate is 'nitrate,' and it is classified as the 'acid radical.'

What materials are needed to perform the experiment on lead nitrate?

The materials needed are lead nitrate salt, copper turnings, and concentrated sulfuric acid.

How is the lead nitrate salt prepared for the experiment?

A small amount of lead nitrate salt is placed in a test tube, followed by the addition of copper turnings.

What happens when concentrated sulfuric acid is added to the lead nitrate and copper turnings?

When concentrated sulfuric acid is added, the mixture is heated, producing reddish-brown vapors, which indicate the presence of nitrate.

What does the appearance of reddish-brown vapors signify in the experiment?

The appearance of reddish-brown vapors signifies the confirmation of nitrate in the experiment.

What is the second test mentioned for identifying lead nitrate?

The second test mentioned is the 'brown ring test,' which will be shown in a future video.

How is the basic radical of lead nitrate (lead) identified in the experiment?

The basic radical (lead) is identified by preparing the original solution and adding potassium iodide, which forms a yellow precipitate indicating the presence of lead.

What is the original solution, and how is it prepared?

The original solution is a solution of the salt in water, where the salt completely dissolves. If the salt doesn’t dissolve well, nitric acid can be added to help dissolve it.

What is the color of the precipitate formed when potassium iodide is added to the original solution of lead nitrate?

A yellow precipitate is formed, confirming the presence of lead in the solution.