Explain how we could prove specifically (by precipitation method) the presence of chloride, bromide or iodide from a solution that contains halide ions.

We could use nitric acid and silver nitrate to prove the presence of chloride, bromide or iodide from a solution that contains halide ions.

Explanation:

The precipitation method involves the precipitation of the halide salts in diffenrent colours. Depending on the colour, it will be possible to indentify which halide ion is present in the solution.

The first step is addind a diluted solution of nitric acid to the ionic solution. This is necessary in order to remove any other ions that might interfere in the halides precipitation.

The seconde step is adding a solution of silver nitrate to the ionic solution.  The nitrate of each halide will be of a specific colour:

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e