Alkali Hydroxides

Hg, Pb, Ag after adding 1M NaOH.

After continuously adding NaOH, Ag precipitate dissolved.(19 drops)

After continuously adding NaOH, Pb precipitate dissolved.(17 drops)

After continuously adding NaOH, Hg precipitate dissolved.(15 drops)

Potassium ChromateIn this procedure, we added

K2CrO3 then we put in a centrifuge and decant the supernatant liquid. Pb,Ag,Hg with 6M of Nitric Acid respectively.

After adding NH3. We put it in centrifuge. (We have the same picture with the Group 2 because we used the centrifuge altogether.

Then we added Nitric Acid and we tested the solution if it is acidic or basic by putting a blue litmus paper which eventually turned red. That means the solution is acidic.

Lastly, we added 1M of KI then Hg turned basic by turning the red litmus paper into blue.

Aqueous Ammonia

2M Ammonia is the reagent used. Ag with NH3. The solution appeared to be white. And had the precipitate.

Pb with NH3. The solution appeared to be cloudy but no precipitate seen.

Hg with NH3. The solution appeared to be cloudy but no precipitate seen same with the Pb. The only thing Hg differs from Pb is that when Ammonia added into it, it appeared to be severe cloudy than PbNH3

Chloride Ion *1st Portion

The test solutions after adding a 3M HCl. (Pb,Ag,Hg)

After the centrifugation. The AgCl and PbCl had the white crystalline ppt. While the HgCl seemed to have not quite visible gelatin-like ppt.

Heating the test solutions for about 5 mins. after adding the 10 drops of distilled H2O. And PbCl’s precipitate dissolved afterwards.

PbCl added 3-5 drops K2CrO3

*2nd Portion

We added NH3 to the following test solutions. (AgCl and HgCl, respectively)

1M Potassium Chromate 6M Nitric Acid 12M NH4OH

1M KI 2M Ammonia 3N HCl

Experiment II: Comparative Reactions of Group I Cations.Salando, R., Cabitac, Z., Valeriano, C., Garachico, J., Rivera, S.

MT 2-4Mr. Raymond Sales

Objectives: - Perform the different steps in separating group I cation - Distinguish the color reaction and identify the specific cation

*Materials/Reagents:

0.1 M Silver Nitrate Lead Nitrate 2M HCl

Mercuric Nitrate Centrifuge 1M Sodium Hydroxide