Mixing Strong Concentrated Acid and Base

In this video you can see how I am mixing concentrated acids of various strengths with a strong base called sodium hydroxide.

The acids you can see used are 100 % acetic acid, 85 % phosphoric acid, 30 % hydrochloric acid and 96 % sulfuric acid.
These are sorted in the order of increasing strenght. Hydrochloric acid would be stronger than acetic acid, if I would use the anhydrous acid. But because that would be way to dangerous (it is a very volatile toxic gas) I am just using a 30 % aqueous solution. This aqueous solution has a lower acid strenght than the concentrated sulfuric acid.

I am doing this on a 16.65 molar scale, so I am using at least 16.65 moles of each acid molecule. This way I have at least one kilogram of each acid. That also means I always have to use 666 g of sodium hydroxide as one equivalent. For some reactions I use the sodium hydroxide in pure form, for other reactions I dissolved it in 666 g of water, to see what difference it makes.