percipitation

speed_bump · 6 Mar 2005, 2:04 PM

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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*~ · 6 Mar 2005, 2:09 PM

nitrates do not form precipitates

look back on your solubility rules. do you have them?

theChemCoach · 6 Mar 2005, 3:45 PM

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 · 6 Mar 2005, 7:03 PM

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

speed_bump · 6 Mar 2005, 7:05 PM

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

speed_bump · 6 Mar 2005, 7:08 PM

i do meen nitrates are soluble....sorry

theChemCoach · 6 Mar 2005, 7:34 PM

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 · 6 Mar 2005, 10:05 PM

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 · 7 Mar 2005, 4:52 PM

s th minor, cl - =p not 2-

6 Mar 2005, 2:04 PM	#1 (permalink)
speed_bump invalid Location: gong Join Date: Mar 2003 Posts: 69 Last Activity: 5 Apr 2005, 11:14 PM	percipitation You can hide this advertisement by registering. Ions in solution -------------------------------------------------------------------------------- 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??? __________________ _

6 Mar 2005, 2:09 PM	#2 (permalink)
Dreamerish*~ Love Addict - Nakashima HSC: 2005 Gender: Female Join Date: Jan 2005 Posts: 3,737 Last Activity: 21 Jun 2006, 12:36 PM	nitrates do not form precipitates look back on your solubility rules. do you have them? __________________ uai :: 98.20 \| b. pharmacy @ usyd \| no more chemistry students til '07

6 Mar 2005, 3:45 PM	#3 (permalink)
theChemCoach chem extraordinaire HSC: N/A Gender: Male Location: Sydney City Join Date: Oct 2004 Posts: 184 Last Activity: 18 Jul 2006, 4:26 PM	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

6 Mar 2005, 7:03 PM	#4 (permalink)
speed_bump invalid Location: gong Join Date: Mar 2003 Posts: 69 Last Activity: 5 Apr 2005, 11:14 PM	B........i really hope................am i right???????? __________________ _

6 Mar 2005, 7:05 PM	#5 (permalink)
speed_bump invalid Location: gong Join Date: Mar 2003 Posts: 69 Last Activity: 5 Apr 2005, 11:14 PM	are there some simple rules that i could learn like nitrates are not soluble.......instead of trying to memerise the table?? __________________ _

6 Mar 2005, 7:08 PM	#6 (permalink)
speed_bump invalid Location: gong Join Date: Mar 2003 Posts: 69 Last Activity: 5 Apr 2005, 11:14 PM	i do meen nitrates are soluble....sorry __________________ _

6 Mar 2005, 7:34 PM	#7 (permalink)
theChemCoach chem extraordinaire HSC: N/A Gender: Male Location: Sydney City Join Date: Oct 2004 Posts: 184 Last Activity: 18 Jul 2006, 4:26 PM	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 __________________ . HSC CHEMISTRY www.chemistrycoach.com.au Last edited by theChemCoach; 7 Mar 2005 at 6:24 PM.

6 Mar 2005, 10:05 PM	#8 (permalink)
speed_bump invalid Location: gong Join Date: Mar 2003 Posts: 69 Last Activity: 5 Apr 2005, 11:14 PM	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 __________________ _

7 Mar 2005, 4:52 PM	#9 (permalink)
xiao1985 duckie's REBORN!!!!! ^^ HSC: 2003 Gender: Male Location: pond... where the ducks are Join Date: Jun 2003 Posts: 5,742 Last Activity: 17 May 2009, 2:11 PM	s th minor, cl - =p not 2- __________________ DUCKIE IS REBORN!!!!! only 3 wks too earlie =S "I am willing to give up any thing for you... even maths!!!!" - anonymous "Don't cry because it ended; smile because it happened." - anonymous

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