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Purpose:
There are four halide salts used in this experiment that are found in the human organic structure. Sodium fluoride is toxicant. but has been traced to be good to worlds in the bar of tooth decay. Sodium chloride is added to many of our nutrients to increase spirit. Sodium chloride is of import for many life procedures. but excessively much consumption is linked to high blood force per unit area. Sodium bromide is distributed throughout organic structure tissues. Sodium I controls cell growing. The chief oxidization figure of the halogens is -1. All halogens. except F have other oxidization Numberss. In this experiment the production of recognizable precipitates and complex ions will be found. Observations will be used to find the halide ion presented in the unknown solution. Hypothesis:

If the halide ions react. so the production of precipitate and complex ions will be recognizable. Materials:

* 24-well microplate
* AgNO3. 0. 1 Meter
* Ca ( NO3 ) 2. 0. 5 Meter
* Baseball gloves
* KBr. 0. 2 Meter
* KI. 0. 2 Meter
* Lab apron





* Na2S2O3. 0. 2 Meter
* NaCl. 0. 1 Meter
* NaF. 0. 1 Meter
* NaOCl ( commercial bleach ) . 5 %
* NH3 ( aq ) . 4 Meter
* Safety goggles
* Starch solution. 3 %
* Thin-stemmed pipets ( 12 )






Procedure:
1. ) Put on safety goggles. baseball mitts. and a lab apron.
2. ) Put 4 beads of 0. 1 M NaF into each of four Wellss in the 1st row. Put 4 beads of 0. 1 M NaCl into each of the four Wellss in the 2nd row. Put 4 beads of 0. 2 M KBr into each of the four Wellss in the 3rd row. Put 4 beads of 0. 2 M KI into each of the four Wellss in the 4th row. Put 4 beads of the individual unknown solution into each of the four Wellss in the fifth row. Put 4 beads of the dual unknown solution into each of the four Wellss in the 6th row. 3. ) Add 4 beads of 0. 5 M Ca ( NO3 ) 2 solution to each of the four halide solutions in column 1. Add 4 beads of 0. 1 M AgNO3 solution to each of the four halide solutions in column 2. Add 4 beads of 0. 1 M AgNO3 + 4 M NH3 solution to each of the four halide solutions in column 3. Add 4 beads of 0. 1 M AgNO3 + 0. 2 M Na2S2O3 solution to each of the four halide solutions in column 4. Add 4 beads of 5 % NaOCl + 3 % starch solution to each of the four halide solutions in column 5. 4. ) Record observations.

5. ) Rinse the microplate into a trough or dishpan provided by your instructor. Clean all setup and your lab station. Return equipment to its proper topographic point. Dispose of chemicals and solutions in the container designated by your instructor. Do non pour any chemicals down the drain or in the rubbish unless your instructor directs you to make so. Wash your custodies exhaustively before you leave the lab and after all work is finished. Consequences:

Consequences of the Reactions of Halide Salts
Halide Salts| Ca ( NO3 ) 2| AgNO3| AgNO3
+
NH3| AgNO3
+
Na2S2O3| NaOCl
+
starch|
NaF| N/A| N/A| Off white PPT| Brown PPT| N/A|
NaCl| N/A| N/A| Brown PPT| Brown PPT| N/A|
KBr| N/A| Gray PPT| Gray PPT| Clear/Brown PPT| N/A|
KI| N/A| Yellow PPT| Yellow PPT| Yellow/ Brown PPT| N/A| Single unknown| N/A| Flaky/Gray PPT| Gray PPT| Clear/Brown PPT| N/A| Double unknown| N/A| Off white PPT| Clean/Brown PPT| Brown PPT| N/A|










The chart above shows the observations and information collected during this experiment. The letters “N/A” means that there was no reaction or show of a precipitate. The colour followed by the letters “PPT” means that there was a reaction demoing the recognizable precipitates and what colour they were. Decision:

Halide ions are really reactive. Fluorine ( F ) ions are present in the equation: AG++F- AgF ( s ) + H2O ( cubic decimeter ) . Chlorine ( Cl ) ions are present in the equation: AG++Cl- AgCl ( s ) + H2O ( cubic decimeter ) . Bromine ( Br ) ions are present in the equation: AG++Br- AgBr ( s ) + H2O ( cubic decimeter ) . Iodine ( I ) ions are present in the equation: AG++I- AgI ( s ) + H2O ( cubic decimeter ) . The generalisations that can be made about Ag halides is that when it is assorted with different reactants it reacts doing the production of precipitates and complex ions recognizable. The individual unknown contains the halide salt KBr. The dual unknown contains the halide salt NaF. I know this because the unknown halide salts react the same manner as KBr and NaF.

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