[schimmel]

I am trying to find out which salt or some other relatively non-hazardous, common and inexpensive substance could make a saturated solution in water with boiling temperature. I am trying to come up with simple method for an autoclave maximum-registering thermometer calibration. NaCl was the only one I found this number online, it is 108.7C. It is kinda too low. It tried a few other salts in the lab - they also give too low for my purposes temperature. I figured that salts with higher solubility would give higher temperatures and I was successful with K₂HPO₄. It is kind of OK but a little too high (130.1–130.2C). I guess I could keep trying (but I would need to buy other salts for that) but maybe somebody knows off hand.
Thanks.

[Borek]

Mixture of KH₂PO₄ and K₂HPO₄ may do the trick - you just need to find correct pH to get a right value for the Van 't Hoff factor.

[curiouscat]

What about acetic acid? BP = 118 C?

If you worry about corrosivity how about 1-Butanol? Also 118 C.