When potassium iodide reacts with lead nitrate what will be the observation what type of reaction is this define it write the balanced chemical equation?

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Table of Contents Show

To Conduct Demonstration
Safety
What is a precipitation reaction?

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A 100mm petri dish containing water is placed on an overhead projector. When solid Pb(NO3)2 is place on one side and solid KI on the other, PbI2 precipitates in the center.

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

To Conduct Demonstration

Place petri dish on stage of overhead projector.
Pour water into dish to a depth of ¼” to 3/8”
Scoop a small amount of Pb(NO3)2 into the water at one side of the dish.
Scoop a small amount of KI into the water directly opposite the Pb(NO3)2
A precipitate of PbI2 will form near the center of the dish.

Demo Time: ~1 minute

Safety

Pb(NO3)2 is toxic. Care should be taken to avoid breathing KI dust.

Acknowledgment

Margaret Asirvatham & Lyn Pierce, Summer 1987
Lora Ruffin and Michael Polk, Summer 2009

Answer

Verified

Text Solution

Solution : On mixing, two colourless solutions of lead nitrate and potassium iodide yellow precipitate is formed. <br> `Pb(NO_3)_2(aq) + 2KI to PbI_2(s) + 2KNO_3(aq)` <br> This is an example for a chemical reaction (double displacement) in which formation of precipitate is observed.

The reaction between lead nitrate and potassium iodide is an example of a precipitation reaction.

Lead nitrate reacts with Potassium iodide to form Lead iodide and Potassium nitrate.

Pb(NO3)2 + 2KI → PbI2 + 2KNO3

The above reaction is also an example of double displacement reaction.

What is a precipitation reaction?

A precipitation reaction is a chemical reaction that occurs in aqueous solution and form precipitates. The insoluble salt that falls out of the solution is known as the precipitate, hence the reaction’s name. It can occur when two solutions containing different salts are mixed, and a cation/anion pair in the resulting combined solution forms an insoluble salt. One other example is

Aqueous silver nitrate (AgNO3) is added to a solution containing potassium chloride (KCl), and the precipitation of a white solid, silver chloride (AgCl), is observed:

AgNO3 (aq) + KCl (aq) → AgCl (s) + KNO3(aq)

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LeadII nitrate reacts with potassium iodide to form leadII iodide and potassium nitrate. How do you write a balance equation for this?

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