Question

Write the molecular formula of green vitriol.

Answer 1

the green vitriol is the heptahydrate of ferrous sulfate. Its formula is $FeS{O_4}.7{H_2}O$ . It is in solid crystalline form. It appears blue-green. Green vitriol is widely used in the field of medicine in the treatment of various diseases and is also used in many industries.

Complete answer:
Vitriol is the general name given to the class of chemical compounds consisting of sulfates of certain metals, originally iron or copper. The name vitriol means small glass, it is given to these compounds because they appear as small glass crystals that are colored. The green vitriol is one such vitriol.
The chemical name of green vitriol is ferrous sulfate or iron(II) sulfate. It is also known as COPPERAS. It is most commonly encountered as the blue-green heptahydrate. The molecular formula of green vitriol is $FeS{O_4}.7{H_2}O$ . This is the most common form of blue-green heptahydrate.
Green vitriol was extensively used in the textile industries as well as metallurgical industries along with some other purposes. Green vitriol is an odorless compound. It can exist in powder as well as in crystal form. It can easily dissolve in water; its solubility is very high. This compound is paramagnetic.
Uses of green vitriol:
Green vitriol in its hydrated form is used medically to treat iron deficiency. It is also used in prophylaxis for iron deficiency in pregnancy and treatment of iron deficiency in anemia. It is mainly used as a precursor to other iron compounds. It is a reducing agent, mostly for the reduction of chromate in cement.

Note:
Apart from green vitriol, there are also other different types of vitriol such as red vitriol, yellow vitriol, white vitriol, etc. sulphuric acid was once in olden times called as oil of vitriol. It is said that it was historically obtained through the dry distillation (pyrolysis) of vitriols.