Qualitative Analysis
Presentation
•
Chemistry
•
9th - 12th Grade
•
Practice Problem
•
Medium
Kamariah sajat
Used 11+ times
FREE Resource
28 Slides • 11 Questions
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Open Ended
Watch this video
Cations (Zn(II), Al(III), Cu(II), Fe(II) and Fe(III): Tested with NaOH. - YouTube
http://www.youtube.com/watch?v=3COr0ol1AxM&feature=fvwrel
1. What is the reagent added to the solutions each containing a cation?
5
Open Ended
Watch this video
Cations (Zn(II), Al(III), Cu(II), Fe(II) and Fe(III): Tested with NaOH. - YouTube
http://www.youtube.com/watch?v=3COr0ol1AxM&feature=fvwrel
2. What is the colour of each precipitate formed?
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Open Ended
Watch this video
Cations (Zn(II), Al(III), Cu(II), Fe(II) and Fe(III): Tested with NaOH. - YouTube
http://www.youtube.com/watch?v=3COr0ol1AxM&feature=fvwrel
3. Is the precipitate soluble in excess reagent?
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How to learn?
As we go along, take note of the cations that give coloured ppts, then those cations which are white ppt and lastly those with no ppt.
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Re-cap
The precipitates formed are metal hydroxides. Some of them dissolve in excess reagent due to the formation of compounds that are soluble in water.
For Fe(II) test, the green ppt turns reddish brown when left to stand due to oxidation of the Fe2+ ions
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Open Ended
Why does the white ppt dissolve in excess NaOH(aq) to form a colourless solution for Zn2+ and Pb2+ ?
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Fill in the Blanks
Type answer...
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Open Ended
Why does Ca2+ form a precipitate with NaOH(aq) but not with NH3(aq)?
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Fill in the Blanks
Type answer...
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Open Ended
Testing anion - chloride ion
https://www.youtube.com/watch?v=TNj0PcSag1k
What do you observe in the test tube?
What is the name of product formed?
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Open Ended
Testing anion - sulfate ion
http://www.youtube.com/watch?v=Zm4NeAjmZbY&p=ED5C5C040AE82D23&index=2&playnext=2
What do you observe in the test tube?
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Multiple Choice
Excess aqueous sodium hydroxide is added to salt X and the solution is heated. A gas is given off which turns red litmus blue.
When this reaction is complete, aluminium foil is added to the solution. A gas is gain given off which also turns red litmus blue.
What is salt X?
ammonium nitrate
ammonium sulfate
zinc nitrate
zinc sulfate
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Multiple Choice
A white crystalline solid, X, is heated with aqueous sodium hydroxide and aluminium. A piece of red litmus paper, held near the mouth of the test-tube, remains red while the mixture is heated for several minutes.
Which conclusion must be correct?
An acidic gas was given off.
X is acidic.
X is magnesium.
X is not ammonium chloride.
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In your notebook, please complete:
(1) Test Yourself 11.3
(2) Let's Review Section B Q2-3 i
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