Write 2 observations when lead nitrate is added to potassium iodide ?
Answers
Answer:
Iodine is a chemical element and react with potassium to form potassium iodide, but not potassium iodine. When a solution of potassium iodide is added into a lead nitrate solution, potassium nitrate and a bright yellow precipitate of lead iodide are produced
Step-by-step explanation:
Doing the Experiment
You can use solutions of lead nitrate and potassium iodide or mix them as dry powders to create the chemical reaction.
To use solutions, pour the same amount of each powder into a test tube and add water to encourage the movement of molecules and ions.
Pour the lead nitrate solution into the test tube with the potassium iodide solution to form lead iodide, which looks like yellow clouds. The clouds are made up of tiny solid particles suspended in the solution. Potassium nitrate forms too, but it is white and disguised by the yellow lead iodide.
If you heat the solution, the lead nitrate dissolves completely. When it cools, it slowly crystallizes, creating large crystals.
To mix the compounds dry, pour both powders into one test tube, cover the opening with a finger, and shake the test tube vigorously. Typically, only liquids and gases have chemical reactions because their molecules are looser and can move around freely and collide with one another. The molecules in solids are tightly packed together, so they don’t have the freedom to move around and collide.
The shaking movement in this experiment makes the surface of the crystals collide with one another, starting a chemical reaction that creates a yellow powder, which is a combination of lead iodide and potassium nitrate.
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