Testing for chlorides, bromides and iodides

The video tutorial explains how to test for chloride, bromide, and iodide ions in water samples. It covers the preparation of samples by dissolving unknown solids in water and acidifying with nitric acid. The addition of silver nitrate forms silver halide precipitates, each with a distinct color: white for chloride, cream for bromide, and yellow for iodide. The video also describes how to distinguish between these precipitates using dilute and concentrated ammonia. Finally, it instructs viewers to write ionic equations for the reactions and summarizes the key points.

What is the first step when working with unknown solids to test for ions?

• Add aqueous silver nitrate directly.

• Dissolve them in water.

• Mix them with concentrated ammonia.

• Heat them to a high temperature.

What color does silver chloride precipitate appear as?

• Yellow

• Blue

• White

• Cream

Which silver halide precipitate is cream in color?

• Silver fluoride

• Silver iodide

• Silver bromide

• Silver chloride

How can you distinguish between silver chloride and silver bromide precipitates?

• By adding dilute ammonia, which dissolves silver chloride but not silver bromide.

• By observing the color change when heated.

• By adding water, which dissolves both.

• By adding concentrated ammonia, which dissolves both.

Which silver halide does not dissolve in either dilute or concentrated ammonia?

• Silver chloride

• Silver fluoride

• Silver bromide

• Silver iodide