Give the chemical composition of the following :
(a) Anhydrone (b) Fluid magnesia (c) Dead burnt plaster (d) Sorel Cement (e) Epsom salt (f) Magnesia mixture

Explanation

(a) Anhydrane : It is magnesium perchlorate with the formula `Mg(CIO_(4))_(2)`.
(b) Fluid magnesia : A 12% aqueous solution of `Mg(HCO_(3))_(2)` is called fluid magnesia.
(c ) Dead burnt plaster : It is anhydrous `CaSO_(4)`
(d) Sorel Cement : It is a hard mass generally used in dental filling. It is a paste of finely divided magnesium oxidation magnesium chloride along with fillers like soap stone and wood fluor. The chemical formula is `MgCI_(2).5MgOO.xH_(2)O`
(e) Epson salt : It is hydrated magnesium sulphate wit formula `MgSO_(4).7H_(2)O`.
(f) Magnesia mixture : It is a mixture of `MgCI_(2)`, `NH_(4)CI` used small amount of `NH_(3)`. It is used for the detetion of phosphate `(PO_(4)^(3-))` and aresenate `(AsO_(3)^(3-))` in qualitative analysis.