Question

ferric sulphate on heating gives??

Answer 1

Explanation:

When ferric sulphate is heated, undergoes thermal decomposition and produces iron (III) oxide and sulphur trioxide.  

$\mathrm{Fe}_{2}\left(\mathrm{So}_{4}\right) 3 \stackrel{\mathrm{t}^{0} \mathrm{c}}{\rightarrow} \mathrm{Fe}_{2} \mathrm{O}_{3}+3 \mathrm{SO}_{3}$

This thermal decomposition reaction requires a high temperature of about $500^{\circ} \mathrm{C}$  to $700^{\circ} \mathrm{C}$ .  The sulphur trioxide further decomposes to give sulphur dioxide.

The gas emitted produces a characteristic smell of burning sulphur. The colour changes from green to white to brown upon heating. Since the gases released like $\mathrm{SO}_{2}$ and$\mathrm{SO}_{3}$ are highly harmful in nature, care must be taken while heating ferric sulphate.

Answer 2

Answer:

On heating ferric sulphate gives one molecule of ferric oxide and three molecules of sulpher trioxide gas.

Explanation:

Ferric sulphate is a salt of iron with the chemical formula of $\bold{\mathrm{Fe}_{2}\left(\mathrm{SO}_{4}\right)_{3}}$. It is heated to form ferric oxide $\bold{\left(\mathrm{Fe}_{2} \mathrm{O}_{3}\right)}$, and sulphur trioxide $\bold{\left(\mathrm{SO}_{3}\right)}$.  

The balance chemical equation can be written as:

$\bold{\mathrm{Fe}_{2}\left(\mathrm{SO}_{4}\right)_{3} \rightarrow \mathrm{Fe}_{2} \mathrm{O}_{3}+3 \mathrm{SO}_{3}}$

Hence we can say that the thermal decomposition of one molecule of ferric sulphate forms one molecule of ferric oxide and three molecules of sulpher trioxide gas.

Here ferric oxide is a red color iron oxide. It is main ingredient of rust which is formed during the corrosion.