Hg2Cl2 is known as calomel. It is prepared by heating HgCl2 and Hg in an iron vessel.

It can also be prepared by mixing mercury salt with chloride ions.

Properties

1) It is a white powder which is insoluble in water.

2) Hg2Cl2 on heating dissociates into HgCl2 and Hg.

action of calomel on heat

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Corrosive sublimate

HgCl2 is a corrosive sublimate, which is prepared by passing chlorine over heated mercury or mercury chloride.





It can also be prepared by heating mercury sulphate with NaCl.

action of mercury sulphate with NaCl

Properties

1) It is a crystalline solid.

2) It is soluble in hot water, ethanol and ether.
3) HgCl2 reacts with KI and forms a colorless solution known as Nessler`s reagent.


nessler s reaction
						

							Hg2Cl2 is known as calomel. It is prepared by heating HgCl2 and Hg in an iron vessel.

Hgcl2+Hg  _______ Hg2cl2

It can also be prepared by mixing mercury salt with chloride ions.

Properties

1) It is a white powder which is insoluble in water.

2) Hg2Cl2 on heating dissociates into HgCl2 and Hg.

Hg2cl2 --------------Hgcl2+Hg

Corrosive sublimate

HgCl2 is a corrosive sublimate, which is prepared by passing chlorine over heated mercury or mercury chloride.

Hg+cl2    _____________ Hgcl2
Hg  cl2+cl2 ______________2Hgcl2

It can also be prepared by heating mercury sulphate with NaCl.
H2so4+2Nacl _______________ Hgcl2+Na2so4

Properties

1) It is a crystalline solid.

2) It is soluble in hot water, ethanol and ether.
3) HgCl2 reacts with KI and forms a colorless solution known as Nessler`s reagent
Hgcl2+2ki _____________ HgI2+2kcl
HgI2+2ki _____________ k2[HgI4]
                                         (nessler`s reaction)
						

							r ok
						

							all the best  indu