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THX1138

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About THX1138

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  1. I want to use lithium chloride to help me calibrate some humidity sensors in a sealed box. Apparently a saturated solution of lithium chloride can keep air at a humidity of 11.3% at room temperature. My question is, if I had 30 grams of LiCl in a container that wasn't sealed, so it could keep absorbing water from the environment, am I right in thinking it would be able to absorb ~35.6 ml of water? The solubility is 84.3 g/100 ml at 25 °C so I figured 84.3 g / 30 g = 2.81 and 100 ml / 2.81 = 35.6 ml - I want to make sure it can't overfill its container and cause a spill if I can't keep it airtight. Potassium carbonate has a solubility of 111-138 g/ml at 20 °C, depending who you ask - does that mean it will absorb more water from the air (per unit of mass), provided the humidity is high enough? I'm also wondering whether I'd need to add any water at all to the LiCl. I plan to check what humidity I get without adding water anyway, but since it's so hygoscopic and meant to be taking water out of the air, it seems counter productive for me to waste some of its capacity by deliberately adding water (I'm 100% certain that the air I will be conditioning will start out much higher than 11%). Also, when the time comes to regenerate my anhydrous LiCl, can I dry it at a lower temperature if I use a vacuum chamber? I read that you need up to 186 °C to drive off all the water from LiCl and I was hoping I could do it in its polypropylene bottle by just lowering the pressure.
  2. Suppose you wanted to carry 500-1000 ml of a solution to neutralise acid or alkali attacks, what would the solution contain? I realise it should be a buffer and it also can't be too strong to prevent damaging body tissues with heat. I guess it would be ideal if it didn't effervesce either so it doesn't spread the acid/base around? I know you're meant to douse 30 minutes with water but I'm never going to carry 100 gallons of water so that's more of a second aid than a first aid. I'm not planning on getting attacked and it may not be worth the effort of carrying around a solution for this marginal eventuality but I did wonder what the solution should contain. I figure if you're only carrying 500-1000 ml, a buffer would be more help than plain water. That said, it's more practical to carry plain water because you can also drink it. That said, I wouldn't want to drink it if I knew I needed to treat acid/base with it later.
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