Sulphate

Copper(ii) sulfate is the chemical compound with the formula cuso4. This salt exists as a series of compounds that differ in their degree of hydration. The anhydrous form is a pale green or gray-white powder, whereas the pentahydrate (cuso4·5h2o), the most commonly encountered salt, is bright blue.

Diethyl sulfate is a highly toxic and likely carcinogenic[1] chemical compound with formula (C2H5)2SO4. It occurs as a colorless liquid with a peppermint odor.Diethyl sulfate is used as an alkylating agent to prepare ethyl derivatives of phenols, amines, and thiols.

Dimethyl sulfate is a chemical compound with formula (CH3O)2SO2. As the dimethyl ester of sulfuric acid, its formula is often written as (CH3)2SO4 or even Me2SO4, where CH3 or Me is methyl. Me2SO4 is mainly used as a methylating agent in organic synthesis.

Iron(II) sulfate (Iron(II) sulphate) or ferrous sulfate (ferrous sulphate) is the chemical compound with the formula (FeSO4), known since ancient times as copperas. It is most commonly encountered as the blue-green heptahydrate.

Alum is both a specific chemical compound and a class of chemical compounds. The specific compound is the hydrated aluminium potassium sulfate with the formula KAl(SO4)2.12H2O. The wider class of compounds known as alums have the related stoichiometry, AB(SO4)2.12H2O.

Ammonium iron(II) sulfate, or Mohr's Salt, is a double salt of iron sulfate and ammonium sulfate, with the formula [NH4]2[Fe][SO4]2·6H2O. Mohr's salt is preferred over iron(II) sulfate for titration purposes as it is much less affected by oxygen in the air than iron(II) sulfate, solutions of which tend to oxidise to iron(III). The oxidation of solutions of iron(II) is very pH dependent, occurring much more readily at high pH.

Iron(III) sulfate, is the compound of iron and sulfate (made of sulfur and oxygen atoms). The compound is different from the more common iron(II) sulfate in that the ratio of sulfate ions to iron ions is larger.

Ammonium iron(II) sulfate, or Mohr's Salt, is a double salt of iron sulfate and ammonium sulfate, with the formula [NH4]2[Fe][SO4]2·6H2O. Mohr's salt is preferred over iron(II) sulfate for titration purposes as it is much less affected by oxygen in the air than iron(II) sulfate, solutions of which tend to oxidise to iron(III). The oxidation of solutions of iron(II) is very pH dependent, occurring much more readily at high pH. The ammonium ions make solutions of Mohr's salt slightly acidic, which prevents this oxidation from occurring. The relevant equation for this is: