Why is milk given to someone who accidentally ingests a heavy metalion such as silver or mercury?

Answer 1

because it negates the effect of the ion

Answer 2

There is probably no good reason to give a person milk because the protein in the milk stimulates the secretion of stomach acid which accelerates the production of soluble metal salts.

Large quantities of Mercury (half a cup or so) used to be given as a treatment for constipation. The density of the mercury guarantees a quick transit time through the digestive tract and the (one must presume) forcible expulsion of any obstruction.

Mercury metal is not water soluble. Since it was used as a treatment it must be assumed that most of the patients survived.

Silver metal is rather inert and, unless the shape or size poses a hazard, it should pass harmlessly. If it was a silver knife or fork, you ought to get a surgeon's opinion. Answer The mercury ingestion warning commonly reads; "Never give anything by mouth to an unconscious person. Do not perform mouth to mouth resuscitation. If conscious rinse mouth with water. Do not induce vomiting. Consult a physician."

Answer 3

Milk components (proteins) react with heavy metal ions forming precipitates which can easily released.

Answer 4

because it negates the effect of the ion