CHEM 101L Chapter Notes - Chapter 6.1: Strontium, Rubidium, Barium

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CHEM 101: Solubility Rules and Identification of Reaction Occurrence
In general, many 1+ and 1- ion compounds are soluble in water, in other
words they exist in aqueous states when dissolved in water. In general any 1+ with
2- ion compounds and 2+ with 1- ion compounds are also soluble in water solvent
and are in an aqueous state. Many 2+ with 2- ion compounds will not be soluble in
water and therefore exist in a solid state when in water. 2+ with 3- also follows that
same rule of being insoluble. 3+and 3- ion compounds (for the majority of this
course) will ALWAYS be insoluble. There are some notable exceptions to this in
organic chemistry, but those exceptions are to be discussed in a different higher
division course, so for CHEM 101 purposes just know that 3+ with 3- will always
be insoluble. 3+ and 2- ion compounds also tend to be insoluble.
Many elements that form compounds will generally follow this rule, but there are
exceptions, and that is where Solubility Rules come into play.
Lithium, Sodium, Potassium, Rubidium, Cesium, and Ammonium have no
exceptions, and they are always soluble when combined with any negatively
charged ion.
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