meccuery Flashcards
(17 cards)
What is the chemical formula for corrosive sublimate?
HgCl2
How is HgCl2 prepared from mercury?
By heating mercury with chlorine gas.
Reaction: Hg + Cl2 → HgCl2
What is one method of preparing HgCl2 using mercurous chloride?
Treating mercury or mercurous chloride with aqua regia.
Which two acids are involved in the reaction to prepare HgCl2 from HgSO4?
HCl and HNO3
What happens when mercuric sulphate is heated with sodium chloride in the presence of MnO2?
HgCl2 sublimes off.
What is the appearance of HgCl2?
White crystalline solid.
Is HgCl2 soluble in cold water?
Slightly soluble.
Is HgCl2 soluble in hot water?
Strongly soluble.
What is the nature of HgCl2?
Poisonous and corrosive.
What occurs to HgCl2 upon strong heating?
It decomposes to free mercury and chlorine.
What happens when HgCl2 is treated with SnCl2?
It is reduced to mercurous chloride and then to Hg.
What is formed when SO2 gas is passed through a solution of mercuric chloride?
A white precipitate of mercurous chloride.
What precipitate forms when mercuric chloride solution is treated with KI solution?
Red scarlet precipitate of HgI2.
What happens to the scarlet precipitate of HgI2 upon further addition of KI solution?
It dissolves due to the formation of complex potassium mercuric iodide.
What is Nessler’s reagent?
Alkaline solution of potassium mercuric iodide.
What is the formula for potassium mercuric iodide?
K2[HgI4]
Fill in the blank: When HgCl2 reacts with SnCl2, it produces _______.
Hg2Cl2
