Testing For Chlorides, Bromides & 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 solids and acidifying them with nitric acid. The addition of aqueous silver nitrate leads to the formation of 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 provides ionic equations for the reactions and concludes with a summary of the key points.

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

• Mix them with concentrated ammonia.

• Heat them to a high temperature.

• Dissolve them in water.

• Add aqueous silver nitrate directly.

What color is the precipitate formed when chloride ions are present?

• Blue

• White

• Cream

• Yellow

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

• By adding concentrated ammonia.

• By heating the solution.

• By observing the color change in sunlight.

• By adding dilute aqueous ammonia.

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

• Silver chloride

• Silver iodide

• Silver bromide

• Silver fluoride

What is the purpose of writing ionic equations for the precipitation reactions?

• To measure the pH of the solution.

• To determine the temperature of the reaction.

• To understand the chemical process involved.

• To predict the color of the precipitate.