Question #8ed65

1 Answer
Stefan V.
Mar 19, 2015

The solubility of potassium alum (anhydrous) is #"118 g/L"# at #"20"^@"C"#.

http://www.paulslab.com/chemicals/potassium-alum.html

According to the above solubility chart, potassium alum's solubility exceeds #"1.4 kg/L"# at around #"80"^@"C"#.

At #"100"^@"C"#, this value is estimated at being approximately #"3 kg/L"#, which means that, at #"95"^@"C"#, its solubility will be somewhat lower than this projected value.

In the case of iron (II) oxalate, I was only able to find data on its solubility at #"25"^@"C"# (in dihydrate form), which is listed at being #"0.097 g/100 g"#.

This very low solubility at room temperature means that iron (II) oxalate is, for all intended purposes, insoluble, or sparingly soluble at best, at this temperature.

If someone can find some reliable information on iron (II) oxalate's solubility at the requested temperature, feel free to add to the answer.

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