Question

Two test tubes a and b contain sodium iodide and potassium iodide and sodium bromide potassium bromide would you find which test tube contain which salt

Answer 1

Answer:

If you dry out an aqueous solution of sodium chloride you would have sodium chloride on the walls. If you then added lead nitrate, you would have some lead nitrate powder on top of the sodium chloride.

If you added lead nitrate to an aqueous solution of sodium chloride, you would get an immediate precipitate of lead chloride. If you evaporated this, you would get a layer of mainly lead chloride (with some trapped sodium nitrate and water) and a layer of mainly sodium nitrate with some trapped lead chloride.

If you evaporated a solution of sodium chloride, you would have sodium chloride on the walls. If you now added an aqueous solution of lead nitrate, I would expect the salt to start dissolving and lead chloride to start precipitating.

hope its helpful