What is freshly prepared feso4 used in ghe brown ring test

Hey friend your answer :

Freshly prepared ferrous sulphate is used is used in brown ring test, because if feso4 is stored or it is the old one then it reacts with atmospheric oxygen and get oxidized to form a corrosive brown-yellow coating of basic ferric sulphate which is an adduct of ferric oxide and ferric sulphate.

yes they ca   is ur ansswerrr

"you start with 15.67 g mgco3-xh2o, when heated and all the water is removed, you are left with 7.58 g mgco3 only.

therefore, you had 15.67 - 7.58 = 8.09g h2o  

moles of each :

7.58g mgco3 = ? moles = 7.58g / 83.4g/mole = 0.09moles  

8 09g h2o = ? moles = 8.09g / 18g/mole = 0.44moles  

molar ratio between the two by dividing both numbers by the smallest number :

0.09 / 0.09 = 1  

0.44 / 0.09 = 4.8  

mgco3-5h2o"