The CRC table actually says that 100 grams will dissolve in 100 cc of cold water. It doesn't say what the final volume will be. That would form a 50% solution by weight, which K2CO3 can do. It also says that <100 grams will dissolve in hot water, but not how much less. However, I was not approaching the stated solubility in cold water, and heating usually speeds up solution, so I 'm mystified about why the 320 grams wasn't dissolved after a half hour of stirring and even after sitting overnight.
Originally Posted by Photo Engineer