Making the Acid

[brown8775]

Hello all, I'm trying to make the acid to dissolve the fleshy looking substance that is blocking the doorway. I've placed all of the different chemicals into the contraption with valves in the lab. I have an off-white coloured vessel that I believe is meant to contain the finished product, yet I can't set the vessel down on the table under the spout for some reason. Hence I am unable to collect the acid when the chemicals mix and it comes out of the spout!
Is there something else that I am missing?! If so, then I hope it's down here in the lab because the stairs have collapsed.
Please Help!!
Thank you!