Lead Nitrate and Potassium Iodide Reaction Experiment | Class 10 Science Chemical Reactions and Equations

The lead nitrate and potassium iodide reaction is an important Class 10 Science experiment prescribed for RBSE practical work and based on Chapter 1 Chemical reactions and equation of NCERT.

In this experiment, two colourless solutions lead nitrate and potassium iodide react to form a bright yellow precipitate of lead iodide demonstrating a double displacement reaction and precipitation reaction.

This experiment helps students understand how new substances are formed during a chemical reaction.

Experiment No - 2- Lead Nitrate and Potassium Iodide Reaction

Objective

To study the reaction between lead nitrate solution and potassium iodide solution

Materials/ Apparatus

   1. Lead nitrate solution

   2. Potassium iodide solution

   3. Two test tubes

   4. Dropper

   5. Test tube stand

Theory

When an aqueous solution of lead nitrate reacts with an aqueous solution of potassium iodide, a yellow insoluble solid called lead iodide is formed. This reaction is an example of a double displacement reaction and also a precipitation reaction because an insoluble solid is produced.

Procedure

 

You should follow these steps to perform this experiment:

   1. Take about 5 mL of lead nitrate solution in a test tube.

   2. Take about 5 mL of potassium iodide solution in another test tube.

   3. Add potassium iodide solution slowly into the test tube containing lead nitrate solution.

   4. Shake the test tube gently and observe the changes.

Observation

   ·     A bright yellow coloured precipitate is formed immediately.

   ·     The solution turns cloudy due the formation of lead iodide.

Chemical Equation

 Pb(NO₃)_2(aq) + 2KI_(aq) →PbI_2(s)  + 2KNO_3(aq)

Result

When lead nitrate reacts with potassium iodide solution, a yellow precipitate of lead iodide is formed. This confirms a double displacement reaction. The reaction is also known as precipitate reaction.

Precautions

   ·     Use clean test tubes

   ·     Add the solution slowly

   ·     Do not touch the chemical directly

   ·     Wash hands after the experiment.

Viva Questions

Q1. What is the colour of precipitate formed in this reaction?

Q2. Name the precipitate formed.

Q3. What type of reaction involved in the experiment?

Q4. Why is this called a precipitate reaction?

Q5. Write the balanced chemical equation?

Viva Answers

    1. The precipitate formed is yellow in colour.

    2. The precipitate is lead iodide.

    3. It is a double displacement reaction.

    4. Because an insoluble solid (precipitate) is formed during the reaction.

    5. Pb(NO3)2(aq) + 2KI(aq) →PbI2(s)  + 2KNO3(aq)

   Related Topics 

    1. Burning of Magnesium Ribbon Experiment

    2. Zinc and Hydrochloric Acid Reaction Experiment

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