Well that certainly makes sense thinking about the 25ml TA test.
So if you have a TA of 100, you need at least 10 drops of R-0009 to remove all of the carbonate alkalinity from the sample?
That should move the pH from 7.8 to ~6.1. Is that a low enough pH level for the drop based borate test to work? Maybe add a drop or two from the figure above?
Just thought, there is more than carbonate alkalinity involved in "Total Alkalinity". Not sure my question above makes sense now.
I use muriatic acid in my pool. I was wondering so I can estimate the pH and TA drop for the R-0009 drops for the drop based borate test.
No problems. Remember that the first yellow point is just setting the solution pH low enough to see the blue when you bring it up with the R-0010.
I have found that when I use 8-10 drops of R-0009, one drop of R-0010 gets you to the yellow-green color and then the second drop gets you to the baby blue. So going lower in pH with R-0010 just means adding (and wasting) R-0010.
As I say in the instructions, it would be nice if the titrant was a little less concentrated as it would make the transition a bit easier to see. If I had my own chem lab, all of the right standard solutions could easily be whipped up...but, alas, those days are over....
And yes, sulfuric acid is much too dangerous to use around a pool. Even though it's acidity is on par with MA, sulfuric acid can readily attack and destroy skin tissue because it is a very strong dehydrating agent as well as a powerful oxidizer. Because it's heat of hydration is very large, it can cause secondary burns as it absorbs water. It can easily destroy proteins and lipids in the skin. If you pour concentrated sulfuric acid in water at a fast enough rate, you will cause the water to boil rapidly and to the point of creating a hazardous over-boil with splashing (don't ask how I know that...). Honestly the stuff should never be used outside of a fume hood and within inches of a safety shower and eye wash.
I once got a very tiny droplet of sulfuric acid on my skin (near the wrist between where a safety glove would end but before my shirt sleeve began). IT HURT LIKE HE _ _!!! and left a nice burn and tiny scar even though I rinsed the area immediately. I've also gotten full strength MA on my skin with no damage at all.