The issue of priority in ionic reactions
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In a solution containing calcium ions, chloride ions, and sulfate ions, which ion does calcium prefer to bind to first? Which expert can provide guidance? Thank you!
Check the solubility product; this is something covered in inorganic chemistry. It can be determined based on the solubility product in the solution and the solubility product at maximum solubility.
What are the criteria for judgment? What is the relationship with the solubility product? Thank you!
Is it the case that those with a smaller solubility product bind preferentially?
Logically, chloride ions do not cause most metal ions to form precipitates; (by \"combine,\" does it mean to form precipitates?) ）
Well, the smaller the solubility product, the easier it is for a precipitate to form.
Calcium sulfate – about 400 parts of water are needed to dissolve 1 part of calcium sulfate dihydrate. Meanwhile, the solubility of calcium chloride in water is 740 g/L, which is not in the same order of magnitude at all. Calcium sulfate is slightly soluble in water and tends to precipitate easily.
It’s not certain. It depends on the types and composition of the various ions in the solution. If none of the compounds reach saturation, they each act on their own, in a free and scattered manner. Here, the problem is of course the calcium sulfate precipitation issue. However, the solubility product of calcium sulfate is a function of the types and concentrations of ions in the solution. Please refer to my post on the theoretical forum: Interesting chemical engineering exam questions – 5: Why does gypsum in seawater not precipitate easily?