The test solution is made basic and drops of 0.1 M Ca(NO3)2 are added but no precipitate forms. To what part of the Experimental Procedure do you proceed? Explain.
Both iodide ion and chloride ion are in the test solution. Describe the appearance of the contents of the test tube after drops of 0.01 M AgNO3 have been added and the solution has been centrifuged.
There is no other “brown ring” test commonly known in chemistry. What is the substance producing the brown ring?
Both iodide ion and chloride ion are in the test solution. Describe the appearance of the contents of the test tube after drops of 0.01 M AgNO3 have been added and the solution has been centrifuged.
There is no other “brown ring” test commonly known in chemistry. What is the substance producing the brown ring?
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The test solution is made basic and drops of 0.1 M Ca(NO3)2 are added but no precipitate forms. To what part of the Experimental Procedure do you proceed? Explain.
this sounds a lot like the procedure of adding Ca+2 or Ba+2 to precipitate out carbonates & phosphates ... brfore you do the group test for Cl-, Br-, I-, & S-2 by adding AgNO3 to an unknown
if so... "added but no precipitate forms...." then prceed to the test for halides & sulfide by adding AgNO3
see page 2 , pre- lim's step 8 at
http://www.byui.edu/chemistry/Lab_Manual…
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Both iodide ion and chloride ion are in the test solution. Describe the appearance of the contents of the test tube after drops of 0.01 M AgNO3 have been added and the solution has been centrifuged.
you will have a precipitate mixture of AgI (yellow ppt) & AgCl (white ppt)
======================================…
There is no other “brown ring” test commonly known in chemistry. What is the substance producing the brown ring?
the brown ring test is for nitrate ion
at the interface of the concentrated sulfuric acid & your unknown,
nitrate is reduced to nitrogen monoxide, NO
it combines with excess Fe+2 ions
making the brown complex ion
often referred to as [Fe (NO)]^+2
but more precisely is [Fe(H2O)5(NO)]+2
http://en.wikipedia.org/wiki/Nitrate_tes…
you can see photos for your anion qual tests at
http://core.ecu.edu/chem/chemlab/exper20…
this sounds a lot like the procedure of adding Ca+2 or Ba+2 to precipitate out carbonates & phosphates ... brfore you do the group test for Cl-, Br-, I-, & S-2 by adding AgNO3 to an unknown
if so... "added but no precipitate forms...." then prceed to the test for halides & sulfide by adding AgNO3
see page 2 , pre- lim's step 8 at
http://www.byui.edu/chemistry/Lab_Manual…
======================================…
Both iodide ion and chloride ion are in the test solution. Describe the appearance of the contents of the test tube after drops of 0.01 M AgNO3 have been added and the solution has been centrifuged.
you will have a precipitate mixture of AgI (yellow ppt) & AgCl (white ppt)
======================================…
There is no other “brown ring” test commonly known in chemistry. What is the substance producing the brown ring?
the brown ring test is for nitrate ion
at the interface of the concentrated sulfuric acid & your unknown,
nitrate is reduced to nitrogen monoxide, NO
it combines with excess Fe+2 ions
making the brown complex ion
often referred to as [Fe (NO)]^+2
but more precisely is [Fe(H2O)5(NO)]+2
http://en.wikipedia.org/wiki/Nitrate_tes…
you can see photos for your anion qual tests at
http://core.ecu.edu/chem/chemlab/exper20…