Lab 7.2

[cwamelo...@gmail.com]

In Lab 7.2 (page 133, Step 1), you state that the solubility of potassium ferricyanide is about 330 g/L. In Lange's Handbook of Chemistry, 15th edn., page 5.17, the solubility of this substance is given as 38 g/L at 10*C and 46 g/L at 20*C. I checked your errata list and could not find any reference to a correction. Is this just a typo? The correct amount of potassium ferricyanide is stated to make the 0.5 molal solution.
As an old, retired chemist, I am just starting to set up home lab, and your text and videos are very helpful. Thank you. Sincerely, Charlie Amelotti

[Robert Bruce Thompson]

As I remember, I got that figure from the CRC handbook, but I have that
book packed away and can't get to it at the moment. I just checked
Wikipedia, which gives solubilities at 10C and 20C of 38 g and 46 g, but
that's per 100 g of water, not per liter.

As an old, retired chemist, I'm sure you know that solubility tables are
notorious for huge variations among different sources, but my own
recollection is that a liter of water will dissolve a heck of a lot more
that 38 or 46 g of the salt.

[CharlieA]

My bad! I just looked at the table heading and it expresses solubilities
in grams per 100 g of water. I know I meant to check that, but I thought
I already had! Thanks for the quick response.