For humans, a sudden change of blood pH from 7.4 to say 7.5 would be quite significantly harmful https://en.wikipedia.org/wiki/Alkalosis this is because of all the highly specialised proteins in the human body have developed for a specific pH and their complex 3D structures are damaged by Acids and alkali. This is also the case for most animal species on earth.

given that the Xenomorphs blood Ph is EXTREMELY low would it be possible to disturb one's homeostasis and give them Alkalosis by drawing them into a large body of water (or base or buffer solution if you happen to have a large volume of that around I guess) and draw blood letting the water dilute the acid blood raising the Ph enough to do a great deal of harm to the Xenomorph, preferably killing them.

I know that predicting Alien biology is always problematic (though it is worth noting Xenomorphs do have some weird genetic herritage with humans if you believe Prometheus). So:

A. Is there any case in the Aliens "expanded universe" of someone using a tactic like this?

B. are there any known extremophiles capable of withstanding large internal Ph ranges?

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    They can swim just fine; youtube.com/watch?v=cv7_7dSbaOk – Valorum Mar 12 '18 at 18:08
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    @Valorum but can they swim in water with a crapload of baking soda dissolved in it? – Forral Mar 12 '18 at 19:02
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    @Forral - I demand you go find out and come back and tell us. – Valorum Mar 12 '18 at 19:10
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    Its worth noting i did mention drawing blood in my question, though enjoying the tangent anyway – Ummdustry Mar 12 '18 at 19:32
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    I know it's not a full answer, but I think it's worth noting: The closest example I know of is that Predators' blood was established to have a neutralizing effect on the Xenomorphs' corrosive blood. I haven't read "Prey" however, so I don't know how violent such a process might be. It'd be interesting to see the Predators using a blowgun with darts filled with their own blood. avp.wikia.com/wiki/Yautja_blood – Vanguard3000 Mar 12 '18 at 21:25

Just "bleeding" wouldn't necessarily do it - after all, if you have a cut on your finger you can dip it into a container of alcohol. Not pleasant, not gonna kill you either. Also, the circulation of the blood would be more likely to be pushing blood out and not letting water enter the circulation system.

As far as sending your xenomorph for a swim in a pool that is very basic in pH that wouldn't cause any extra issues that even a mostly pH neutral thing would experience - alkalines can burn/dissolve matter somewhat like acids can. In fact, a new thing for "cremation" is alkaline hydrolysis where the body is broken down by a very high pH solution.

A. Is there any case in the Aliens "expanded universe" of someone using a tactic like this?

Not sure on the Aliens universe, but fanfiction writer AA Pessimal addressed how the Assassin's Guild of Ank-Morpork dealt with a xeno, involving a container surrounded by alkaline salts. Takes up a good part of his "Slipping Between Worlds" - https://www.fanfiction.net/s/6159511/1/Slipping-Between-Worlds If you like the Discworld, he writes very well and writes good stuff. If you don't like the Discworld, I don't know what is wrong with you :)

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    I do indeed like discworld – Ummdustry Mar 12 '18 at 19:28
  • @Ummdustry - you are gonna LOVE Pessimal's stuff then. GNU Terry Pratchett. Today is 3 years. – ivanivan Mar 12 '18 at 19:34

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