RP4 Identifying cations and anions

Question 1

How do you test for group 2 metal cations

Answer 1

Place 10 drops of a group 2 compound in test tube
Add 10 drops of NaOh to test tube, record observations
Continue to add NaOh so its in excess, record

Question 2

Results of group 2 with NaOH

Answer 2

Picture

Question 3

How to distinguish between calcium bromide and strontium chloride

Answer 3

Add 10 drops of sulfuric acid, record then add until excess.
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Question 4

Overall group 2 reactions

Answer 4

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Question 5

How to test for ammonium ions (NH4+)

Answer 5

Place 10 drops NH4Cl. Add 10 drops NaOH. Shake
Warm solution
Test gas released with damp red litmus paper
If it goes blue, ammonium ions present

Question 6

How do you test for group 7 ions

Answer 6

Add nitric acid and silver nitrate, Record observations
To samples add dilute the conc ammonia
Picture

Question 7

How do you test for hydroxide ions (OH-)

Answer 7

Test with litmus paper. Turns damp red litmus paper blue

Question 8

How do you test for carbonate ions
CO3 2-

Answer 8

Put in test tube
Add Na2CO3 in another test tube then add equal volume of HCl

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Question 9

How to test for sulfate SO4 2- ions

Answer 9

Add HCl and BaCl2 to solution
If present a white ppt of BaSO4 will form

Question 10

Order of testing ions

Answer 10

Carbonate, sulfate, halide
Prevents false positives