percipitation (1 Viewer)

[speed_bump]

Ions in solution
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mixing which of the following pairs of solutions would result in the formation of a percipitate?

a) silver nitrate and ammonium pechlorate
b) ammonium acetate and calcium iodide solutions
c) ammonium sulfate and copper(II) nitrate solutions
d) calcium acetate and ammonium chloride solutions
e) ammonium bromide and mercury(I) nitrate solutions

i know it has somthing to do with the nitrates, but what is again???

 

[Dreamerish*~]

nitrates do not form precipitates
look back on your solubility rules. do you have them?

 

[funking_you]

You should be able to figure out any ionic combinations using these tables:

• Concise Solubility Table

• Detailed Solubility Table

From what i can see, only one combination will result in a precipitate.

speed_bump, which one?


George

 

[speed_bump]

B........i really hope................am i right????????

 

[speed_bump]

are there some simple rules that i could learn like nitrates are not soluble.......instead of trying to memerise the table??

 

[speed_bump]

i do meen nitrates are soluble....sorry

 

[funking_you]

Well the answer is (e), i.e. mercury(I) bromide would be insoluble.

You should keep in mind the following simple rules:

SOLUBLE

• All Na⁺, K⁺, and NH₄⁺ salts are soluble

• All nitrate's are soluble (NO₃^-)

• All sulfate's are soluble (SO₄^2-), except Pb²⁺ and Ba²⁺

• All chorides are soluble (Cl^-), except Ag⁺, and Pb²⁺

INSOLUBLE

• All carbonates (CO₃^2-) and phosphates (PO₄^3-) are INSOLUBLE , except for Group I and NH₄⁺

• All hydroxides (OH^-) are INSOLUBLE , except for Group I and NH₄⁺

These are the general rules you need to learn, you will be examined on many of these combinations in module 3, you will NOT encounter difficult examples like those you originally posted in the HSC.

So, does that help?

George

 

[speed_bump]

yes it does, thankyou........... yer im not acually doing hsc chem.....i did that a couple of years ago.............im at uni and having a bit of trouble remembering some of those basic things..........but yer thanks

 

[xiao1985]

s th minor, cl - =p not 2-