Acid sulfuric

[dominicelliott]

"Let s assume the pH, as with most municipal tap waters, is
approximately 8 or 9. Begin adding 95% H₂SO₄ one drop at a time,
mixing thoroughly, and measuring the pH with the pH meter or the
range 5.0-6.5 pH papers between each drop until the pH is about 5.8
or 6.0."

I'm not sure if i read that the sulfuric acid has to be clear, or not.
I bought one bottle at home depot, virgin sulfuric acid. It's not clear, kind of rusty brownish.
Can this be ok to use to lower the PH?

Thank you.

[ChenBeier]

The question is what you want to do with this water later on. The sulfuric is an technical one and contain impurities, which can disturb further reactions.
Only to lower pH it will work, but 95% is to strong. I dont think you can react pH 5 by using drops, it will go down to 1 or 2.
What is the volume of the water.