Anyone know the difference between anhydrous and monohydrate citric acid? Which would be needed to the concoction in the video in the first post?
I have a technical paper about using citric to clean up boilers. They settled on using a solution of only 0.2% of citric in water (that's by weight) but they did operate it at 60'C and said it was effective "within a short duration". In DIY use, we may not be able to operate at 60'C if working on larger items, in which case, using a more concentrated solution is probably needed. There's always the question of getting a good balance between having a sufficient concentration that it works in a reasonable period of time, but does not significantly attack the good metal. There's a rule of thumb in chemistry (it works with lots of stuff but not everything) that for each increase in temperature of 10'C, you will speed up the rate by a factor of 2. So, at 60', you could be getting a rate of 16 times faster than that which you would have at 20'C.i use premade liquid citric at work... any idea what sort of percentage the recipe is ?