Chemistry Halogens Lab
Maggie Mitchell
IB Chemistry Prd. 5
THE HALOGENS LAB
Date:
9/11/13
Purpose:
The purpose of this experiment was to observe and record the halogens' (NaF, NaCl, NaBr, and KI) reactions with the chemicals Ca(NO3)2, AgNO3, and NH4OH and use these observations to identify an unknown halogen.
Data:
(see next page)
TABLE 1: REACTIONS OF HALOGENS WITH CA(NO3)2, AGNO3, AND NH4OH
REACTION
NAF
NACL
NABR
KI
REACTION W/ CA(NO3)2
solution turns cloudy and precipitate forms
clear precipitate formed
slightly cloudy precipitate formed
no reaction
REACTION W/ AGNO3
no reaction
white, cloudy precipitate formed
thick white/yellow precipitate formed
cloudy yellow precipitate formed
REACTION W/ NH4OH
does not dissolve; precipitate becomes defined
does not dissolve; precipitate becomes defined
does not dissolve
TABLE 2: REACTION OF HALOGENS WITH HEXANE AND CHLORINE WATER
REACTION
NAF
NABR
KI
COLOR OF THE TOP LAYER
clear
yellow
pink
IS THIS HALOGEN MORE OR LESS ACTIVE THAN CL?
more
less
less
TABLE 3: REACTION OF UNKOWN HALOGEN D WITH CA(NO3)2 AND AGNO3
REACTION USED TO TEST THE UNKNOWN
RESULT OF THE TEST
POSSIBLE IDENTITY OF THE UNKNOWN
Ca(NO3)2
solution turns cloudy and precipitate forms
NaF or NaBr
AgNO3
no reaction
NaF
AgNO3/NH4OH
no reaction
NaF
Questions:
The halogens should have similar chemical properties because they all belong to the same group in the periodic table. When elements are in the same group that means that they have the same number of valence electrons. Valence electrons determine an element's chemical properties, and when elements have the same amount, it means that they will have similar properties.
When the halogen solutions are mixed with calcium nitrate, generally a cloudy precipitate is formed.
The only halogen to not react this way is KI.
When the halogen solutions are mixed with silver nitrate, generally a thick yellow/white precipitate is formed.
The
IB Chemistry Prd. 5
THE HALOGENS LAB
Date:
9/11/13
Purpose:
The purpose of this experiment was to observe and record the halogens' (NaF, NaCl, NaBr, and KI) reactions with the chemicals Ca(NO3)2, AgNO3, and NH4OH and use these observations to identify an unknown halogen.
Data:
(see next page)
TABLE 1: REACTIONS OF HALOGENS WITH CA(NO3)2, AGNO3, AND NH4OH
REACTION
NAF
NACL
NABR
KI
REACTION W/ CA(NO3)2
solution turns cloudy and precipitate forms
clear precipitate formed
slightly cloudy precipitate formed
no reaction
REACTION W/ AGNO3
no reaction
white, cloudy precipitate formed
thick white/yellow precipitate formed
cloudy yellow precipitate formed
REACTION W/ NH4OH
does not dissolve; precipitate becomes defined
does not dissolve; precipitate becomes defined
does not dissolve
TABLE 2: REACTION OF HALOGENS WITH HEXANE AND CHLORINE WATER
REACTION
NAF
NABR
KI
COLOR OF THE TOP LAYER
clear
yellow
pink
IS THIS HALOGEN MORE OR LESS ACTIVE THAN CL?
more
less
less
TABLE 3: REACTION OF UNKOWN HALOGEN D WITH CA(NO3)2 AND AGNO3
REACTION USED TO TEST THE UNKNOWN
RESULT OF THE TEST
POSSIBLE IDENTITY OF THE UNKNOWN
Ca(NO3)2
solution turns cloudy and precipitate forms
NaF or NaBr
AgNO3
no reaction
NaF
AgNO3/NH4OH
no reaction
NaF
Questions:
The halogens should have similar chemical properties because they all belong to the same group in the periodic table. When elements are in the same group that means that they have the same number of valence electrons. Valence electrons determine an element's chemical properties, and when elements have the same amount, it means that they will have similar properties.
When the halogen solutions are mixed with calcium nitrate, generally a cloudy precipitate is formed.
The only halogen to not react this way is KI.
When the halogen solutions are mixed with silver nitrate, generally a thick yellow/white precipitate is formed.
The