Question

@Abmon98 @Somy

Answer 1

When mercuric iodide is added to the aqueous solution of potassium iodide, freezing point is raised. Why ?

Answer 2

Is this a reaction ?
2KI + HgI2 = K2[HgI4]

Answer 3

I got it !

Answer 4

@Abhisar i don't know about this but i can give you some links where you can find out your answer. ( Think h bhaiya)
1) https://in.answers.yahoo.com/question/index?qid=20091227201257AADQqcR
2) http://www.100marks.in/ask/questions/50586b4a809b9/What-happens-when-HgI-added-to-aq-solution-of-KI
3) http://wiki.answers.com/Q/When_mercuric_iodide_is_added_to_an_aqueous_solution_of_potassium_iodide_freezing_point_is_raised_why

Hope it helps !

Answer 5

Suppose there was 1 molal KI solution. In aqueous solution it will dissociate and form 1 mole K+ and 1 mole I- ions. Now when HgI is added, it forms a stable comlex K2[HgI4]. Now only 1 moles of solute particle are in the solution. depression of freezing point is proportional to moles of solute particles. As number of solute particles is reduced....Freezing point is raised.

Answer 6

Thank you @mayankdevnani !

Answer 7

https://www.google.co.in/?gfe_rd=cr&ei=XyPnU5GsOOSW8Qfc2IH4BQ&gws_rd=ssl#q=When+mercuric+iodide+is+added+to+the+aqueous+solution+of+potassium+iodide%2C+freezing+point+is+raised.+Why+%3F
so many links...go through this and there is 1 link where you satisfy

Answer 8

mention not!! @Abhisar bhaiya

Answer 9

i think because strong ionic bonds are broken

Answer 10

But then freezing point should decrease.

Answer 11

\(\sf \Delta T=K_f\times molality\)

Answer 12

If bonds are broken, then KI-->K+ + I- and HgI -> Hg+ + I-....molality of solutes will increase and hence the freezing point should decrease ?

Answer 13

There must be something which is decreasing the molality !

Answer 14

the reaction is HgI2+2KI-->K2HgI4, hence, 2K+ and 2I- are replaced by 2K+ and HgI4-2. There is a decrease in the number of species in solution. The value of -∆Tf decreases, hence freezing point is raised.

http://books.google.com.eg/books?id=wNYMUeCcaSEC&pg=SA9-PA7&lpg=SA9-PA7&dq=mercuric+iodide+is+added+to+the+aqueous+solution+of+potassium+iodide,+freezing+point+is+raised.&source=bl&ots=TtKKopiJi_&sig=ocFoTu59WOfq67NoX8_yRXcVAR0&hl=en&sa=X&ei=eS7nU-HPOInW0QXJ54GgDA&ved=0CEEQ6AEwBg#v=onepage&q=mercuric%20iodide%20is%20added%20to%20the%20aqueous%20solution%20of%20potassium%20iodide%2C%20freezing%20point%20is%20raised.&f=false

Answer 15

Not able to open the above link !

Answer 16

Got it !
Thank you @Abmon98 !

Answer 17

good, your most welcome :D