1. Which of the following salts is insoluble in water?
QUESTION:
Which of the following salts is insoluble in water?
NaNO3 B. Fe(OH)3 C. AgClO4 D. MgSO4
We need to refer to the empirical solubility rules.
All salts of alkali metals and ammonium are soluble.
Sodium is an alkali metal, so A is ruled out.
2) All nitrates, acetates, and perchlorates are soluble.
C is ruled out.
3) All chlorides, bromides, iodides are soluble except for Ag+, Pb2+, Cu+, Hg22+. Doesn’t apply.
SCRIPT FOR SLIDE ONE
Which of the following salts is insoluble in water, A, sodium nitrate, B, iron three hydroxide, C, silver perchlorate, or D, magnesium sulfate?
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We need to refer to the empirical solubility rules.
Number one, all salts of alkali metals and ammonium are soluble.
Sodium is an alkali metal, so A is ruled out.
Two, all nitrates, acetates, and perchlorates are soluble.
This rules out C, silver perchlorate.
Three, all chlorides, bromides, and iodides are soluble except for silver, lead two plus, copper one, and H g 2 2 plus.
None of our choices have these anions so this rule does not apply.

2. This confirms B as correct.
4) All fluorides are soluble except for Pb2+ and alkaline earth metals. Doesn’t apply.
5) All sulfates are soluble except for Ca2+, Sr2+, Ba2+, Ag+, Pb2+. D is ruled out.
B, Fe(OH)3 should be our answer. But let’s continue with the rules to confirm.
6) All hydroxides are insoluble except for alkali metal, NH4+, Sr2+, Ba2+
This confirms B as correct.
SCRIPT FOR SLIDE TWO
Four, all fluorides are soluble except for lead two plus and alkaline earth metals. Again this doesn’t apply.
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Five, all sulfates are soluble except for calcium, strontium, barium, silver, and lead two plus. This rules out D, magnesium sulfate. We’ve ruled out A, C, and D, so
B, iron three hydroxide, should be our answer. Let’s continue with the rules for confirmation.
The next rule says all hydroxides are insoluble except for alkali metal, ammonium, strontium, and barium. This confirms
that B is the correct answer.

3. Which of the following salts is insoluble in water?
QUESTION:
Which of the following salts is insoluble in water?
A. NaNO3 B. Fe(OH)3 C. AgClO4 D. MgSO4
SCRIPT FOR SLIDE THREE
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4. Video ID: 5-5-JJW © 2008, Project VALUE (Video Assessment Library for Undergraduate Education), Department of Physical Sciences Nicholls State University Author: Jeremy Wessel Narrator: Cynthia Lamberty Funded by Louisiana Board of Regents Contract No. LA-DL-SELECT-13-07/08