Upon receiving PEG we titrate to find its base value so it can be neutralized with HCl for certain processes. It’s typically basic on the micromolar level (I think from residual KOH or another base in the manufacturing process) so it only takes a few ml of 1M acid per kg. Then it’s shaken up and sampled and the base level looks to be zero or slightly acidic. But after drying the material by heating and bubbling nitrogen it once again registers a positive base value and needs more acid. Is this from HCl coming out during drying, loss of dissolved CO2, or something else? At some degree of excessive over acidification this isn’t a problem but I’m still curious to what’s happening. Thanks for any thoughts!