Back to School Week - Thursday: Chemistry!

And here is the example for the Thursday - Chemistry!
A very famous chemist was found murdered in his kitchen today. The police have narrowed it down to six suspects. They know it was a two man job. Their names: Felice, Maxwell, Archibald, Nicolas, Jordan, and Xavier. A note was also found with the body: '26-3-58/28-27-57-16'. Who are the killers?
Event description and rules
Thread will close Friday, 13th of September, 11h59 server time.
This post has been edited 2 times, last edit by "Liusaidh" (Sep 25th 2019, 12:13pm)
I went a local store once. I was going through some stuff when an employee came up to me and said: how may i help you?
I said: Well you can help me choose something for cleaning.
He said: What are you looking for exactly?
I said: Oh well, I actually found what I was looking for, but I'm not very sure. I mean I have HCl here as well as H2SO4, on the other hand I have CH3COOH and Na2CO3.
He said: Ok, what do you need them for?
I said: For cleaning.
He said: OK. What are you going to clean?
I said: The bathroom.
He said: Well, are you looking for an acid or a base?
I said: Acid, of course.
Then he told me which one I should buy.
Which one did he tell me to take and what is its full name?
I said: Well you can help me choose something for cleaning.
He said: What are you looking for exactly?
I said: Oh well, I actually found what I was looking for, but I'm not very sure. I mean I have HCl here as well as H2SO4, on the other hand I have CH3COOH and Na2CO3.
He said: Ok, what do you need them for?
I said: For cleaning.
He said: OK. What are you going to clean?
I said: The bathroom.
He said: Well, are you looking for an acid or a base?
I said: Acid, of course.
Then he told me which one I should buy.
Which one did he tell me to take and what is its full name?
It's better to be silent and be thought a fool than to speak and remove all doubt. What's even better is to weaponize your words to destroy anyone who dares challenge you.

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