Chemical Reactions and Observations

This video tutorial demonstrates methods to identify common anions through chemical reactions. It covers testing halide ions using silver nitrate and chlorine water, identifying carbonate ions with acids, testing hypochlorite ions using litmus paper, and observing sulfite ion reactions with oxidizing agents. Each method includes expected observations and chemical changes, providing a comprehensive guide to qualitative anion analysis.

What is the primary method used to identify anions in a sample?

• Adding heat to the sample

• Using a microscope

• Measuring the pH of the sample

• Adding appropriate reagents and observing chemical changes

What color precipitate is formed when silver nitrate is added to a solution containing chloride ions?

• Pale yellow

• White

• Cream

• Gray

How does the precipitate of silver bromide change when exposed to sunlight?

• It dissolves completely

• It remains unchanged

• It turns blue

• It turns gray slowly

Which halide ion does not dissolve in excess aqueous ammonia?

• Chloride ion

• Bromide ion

• Fluoride ion

• Iodide ion

What color does the organic layer turn if the sample contains bromide ions when using chlorine water?

• Purple

• Orange

• Green

• Blue

What is the expected observation when carbonate ions react with dilute hydrochloric acid?

• A colorless gas is produced

• The solution turns red

• The solution becomes cloudy

• A blue precipitate forms

What happens to lime water when carbon dioxide is bubbled through it?

• It turns milky

• It becomes colorless

• It turns blue

• It remains unchanged

How can hypochlorite ions be tested using litmus paper?

• The litmus paper turns green

• The litmus paper remains unchanged

• The litmus paper turns blue

• The litmus paper turns red

What is the effect of sulfite ions on potassium dichromate solution?

• It turns blue

• It turns from orange to green

• It turns from green to orange

• It remains orange

What happens to bromine water when it reacts with sulfite ions?

• It turns blue

• It turns red

• It remains brown

• It becomes colorless