Question

Bleeding from a cut can be immediately stopped by applying ferric chloride because
(1) Ferric chloride block the surface of cut.
(2) Blood contain negative charged colloidal particle and they are precipitated with FeCl3.
(3) FeCl3 prepare the membrane over the cut.
(4) None of these

Answer 1

Ferric chloride block the surface of cut

Answer 2

The answer is option (2).

Bleeding involves regular loss of blood from the body. As you know, blood is a negatively charged colloid, it requires something 'positively charged' to stop the flow. Hence, positively charged ferric chloride, FeCl3 is used to stop the flow of blood. The blood is precipitated when FeCl3 is applied. FeCl3 is preferred because it has a positive charge of +3. The higher the positive charge, the better the efficiency of a solution to stop the flow of blood. Moreover, FeCl3 does not cause irritation on skin.