Question

Why is alum used for coagulation of blood ?

Answer 1

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This can be accomplished by soluble charged species or ions in water. ... Potash alum has highly charged Al3+ and (SO4)2- ions which act as neutralizing ions for the protein colloid in blood. This causes aggregation orclotting and this in turn stops thebleeding.

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Answer 2

How does potash alum arrest bleeding?

2 ANSWERS

Dhrubajyoti Samanta

Dhrubajyoti Samanta, Master of Chemistry, Experimenter of Chemicals

Answered Nov 30, 2014 · Author has 180 answers and 491.3k answer views

Thanks for the A2A.

Bleeding can be stopped by coagulation of the blood (formation of a clot). This coagulation is the process of aggregation of the colloidal solution of protein in blood. Proteins are charged species and their aggregation or coming together depends on the neutralization (partial or complete) of the charges on the protein molecules. This can be accomplished by soluble charged species or ions in water. Now, if an ion has a high charge density it is more capable of neutralizing charges on the protein or any charged colloid. Potash alum has highly charged Al3+ and (SO4)2- ions which act as neutralizing ions for the protein colloid in blood. This causes aggregation or clotting and this in turn stops the bleeding.

I hope this answers your question.