Iron ll -sulfate FeSO

As part of an experiment to determine the value of x in the formula for iron(ll) sulfate crystals (FeSO HjO) a student titrated a solution of these crystals with 0.0200 mol/dm- potassium manganate(VII) (solution A). 

When a metal is present that forms more than one cation, a Roman numeral is required to specify the cation charge, just as in naming Type 11 binary ionic compounds. For example, the compound FeSO is called iron(ll) sulfate, because it contains Fe " (to balance the 2- charge on SO "). Note that to determine the charge on the iron cation, you must know that sulfate has a 2- charge. 

In 2007, Tian and cowoikers developed an efficient four-component synthesis of Cbz-protected homoallylic amines catalyzed by an environmentally friendly catalyst, iron(ll) sulfate heptahydrate (FeSO -7HjO) (Scheme 12.19) [96]. The authors extended this method to a variety of substrates, obtaining the corresponding products in good yields (43-87%) using only 5mol% of catalyst, at room temperature. 

Another example looks at the reaction between calcium acetate, CafCHjCOO), and iron sulfate, FeSO. The exchange reaction between calcium acetate and iron(lI) sulfate results in the formation of calcium sulfate, CaSO, and iron(ll) acetate, Fe(CH3COO)2. According to the solubility rules, calcium sulfate is an exception and is insoluble. Iron(n) acetate is soluble. So the molecular equation can be written as... 

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