Quote:
Originally Posted by ipgyst |
That's funny. I was just talking about trisodium phosphate in my class 2 hours ago.
Phosphoric acid is a tri-protic acid... trisodium phosphate is the fully un-protonated conjugate base, which is a
STRONG BASE! (Hence the "strongly alkaline" comment in section 9, and "reacts violently with water and acids" in section 10 of the MSDS). Dissolving it in water produces a very basic (alkaline) solution (and is exothermic = releases heat). That's why it irritates skin, eyes, lungs, respiratory tract, stomach, etc.
Avoid exposing "TSP" to any acids... unless you want to see a very exothermic neutralization reaction. And you should add acids to bases, whenever possible... so to reduce the probability of something going horribly wrong, add water (or stronger acid) TO a concentrated solution of TSP, not the other way around, or it'll tend to spatter.
Otherwise, it's fairly non-toxic (in terms of accute toxicity).