Date:14.09.2016, 03:06 Perhaps, a 1 L Teflon-coated, austenitic stainless steel pressure vessel, with appropriate valving, etc. It is easier to add HCl gas under pressure to the 33 solution in order to reach the desired 70. Vapours from this acid will just inflame your nostrils and wreak havoc. Regards, Dinesh - Chennai, Tamilnadu, india Agree with Steve. A hydrochloric acid solution of 70 wt HCl is only stable under very high pressure (about 5.15 MPa or 50.8 atm) HCl vapor at 30 C) and is extremely dangerous. Brandon Halliday - Minden, Louisiana, U.S. July 11, 2012 Q. If I had a large quantity of 15 HCl how do you increase it to 35 solution? Ed Stribling - Houston, Texas USA ADD a Q or A to THIS thread START a NEW THREAD View Th. Otherwise, at room temperature and pressure, the water saturates and no more hydrogen chloride will dissolve. I do produce large amounts of hydrogen chloride at home using the salt / sulphuric method. It's doable at home. Get it wrong, however, and it's going to get very nasty, very quickly. You should see the state of the area I generate the gas in, anything it touches it corrodes.
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