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How can the Phosphoric acid in coke leech calcium from your bones?? >>
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1) The stomach acid is WAAAAAY more potent that the bit of Phosphoric acid in Coke. >>
It's not from the acidity of the phosphoric acid, it is more from (and I'm hardly a biochemist) the phosphate ions bonding with calcium ions (in the blood?).
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2) The Coke is digested in the stomach and broken down into other chemicals. You can't tell me that the Phosphoric acid gets transferred into the blood and delivered to the muscles... >>
Phosphoric Acid (H3PO4) is an ionic compound like other acids. When in aqueous form, it's really a bunch of free-floating H3 and PO4 ions. The HCl and other enzymes in the stomach (and again,I'm hardly a biochemist) would be hard-pressed to split those phosphate ions into anything smaller. When other cations come into contact with the phosphate, given a high enough positive charge (calcium ions?) they could associate with the phosphate ions and "leech" them away. The H+ ions in the H3 bond easily with O2- ions to form water.
So perhaps leeching from the bones is more of a misnomer than leeching calcium from the bloodstream and preventing it from reaching the bones?
Here's a
link to an article regarding acids leeching the enamels from teeth.
Anyways, I'll say for a 3rd time I'm hardly a biochemist, so I could easily be quite wrong. Feel free to strike me down
Edit: Added some quote tags
