Hello, I decided to make up a CaCl2 solution rather than use the solid. I did this because of the hydrophilic nature of CaCl2. It will rapidly take up water and you don't get an accurate weight. So I put 79 g of CaCl2 in about 490 ml of distilled water (water was room temp so about 490 g). The solution gets hot and I cooled it back to room temp and measured the specific gravity as 1.121 which should correspond to a 13.1 weight % solution. This is in pretty good agreement with 79 g in 569 g of solution. When I stored (at room temp) this solution I got a white precipitate that will not go back in solution. Its like I'm above the solubility limit which should be 74.5g in 100ml of water!!!
Am I making a serious calculation error? Has anyone seen this precipitation? Could it be impurities in the solid CaCl2?
Thanks, Bob
Am I making a serious calculation error? Has anyone seen this precipitation? Could it be impurities in the solid CaCl2?
Thanks, Bob