In a message dated 6/12/01 11:44:05 AM EST, [email protected] writes: << Now I am confused. Shouldn't NaCl be neutral, and also a pretty good buffer? Why did the pH go to 8 instead of 7? Any ideas? Marshall >>
Marshall: I thought that in order for a compound to act as a buffer it had to be a salt of, say, a weak base and a strong acid (or the reverse) such as, FeCl3 + 3H2O ----------> Fe(OH)3 + 3HCl not something like NaCl which is the salt of a strong acid and a strong base. At the completion of FeCl3 hydrolysis, the pH is lowered and held constant by the generation of HCl. As far as NaCl raising the pH of your water from 5 to 8, I think you have to take into account the impurity level in your table salt needed to effect the pH of water [ionization constant is 1 x 10^ -14]. How much (acidic or basic salt impurities do you think it takes in your table salt to shift the pH from 5 to 8? You can calculate it using the ionization constant of water. Roger -- The silver-list is a moderated forum for discussion of colloidal silver. To join or quit silver-list or silver-digest send an e-mail message to: [email protected] -or- [email protected] with the word subscribe or unsubscribe in the SUBJECT line. To post, address your message to: [email protected] Silver-list archive: http://escribe.com/health/thesilverlist/index.html List maintainer: Mike Devour <[email protected]>
