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#29 - SolubilityIn chemistry, there are some things that are soluble and some things that aren�t. If something�s soluble, that means it can be dissolved in water. Kool-Aid is soluble, so is sugar. There are a lot of chemicals used in chemistry that are soluble as well. A lot of chemical reactions often occur while these chemicals are dissolved. Usually, resulting in the creation of a non-soluble chemical, which becomes solid(called a precipitate) and either floats to the top or sinks to the bottom. So how do you determine what chemicals are soluble or insoluble without actually dissolving it? Look at the compound. Solubility is determined by the cations and anions that are in that compound. Some makes it soluble, some makes it insoluble. Some common cations and anions are labeled as always soluble, almost insoluble, sometimes, and uncertain. 1. Always soluble: Compounds with these always make the compound soluble, look for these first.
2. Almost Insoluble: Compounds with these are insoluble only if it doesn�t contain anything from the always soluble group.
3. Sometimes: Compounds with these are soluble, but only if it doesn�t have an almost insoluble accompanying it.
4. Uncertain: If a compound doesn�t contain any cations or anions, then it is very difficult to tell if it is soluble or insoluble.
There are some other special rules that sometimes work but sometimes doesn�t work, but it�s best to depend on this. |